diff --git a/src/components/equative-explorer/EquativeDisplay.tsx b/src/components/equative-explorer/EquativeDisplay.tsx
index 8608ed2..0938b02 100644
--- a/src/components/equative-explorer/EquativeDisplay.tsx
+++ b/src/components/equative-explorer/EquativeDisplay.tsx
@@ -1,9 +1,12 @@
 import {
     VerbTable,
     defaultTextOptions as opts,
+    ButtonSelect,
+    Types as T,
 } from "@lingdocs/pashto-inflector";
 import {
     ExplorerState,
+    ExplorerReducerAction,
 } from "./explorer-types";
 import {
     makeBlockWPronouns,
@@ -15,12 +18,13 @@ import {
 } from "../../lib/equative-machine";
 import { isNoun, isPluralEntry, isUnisexNoun } from "../../lib/type-predicates";
 
-function EquativeDisplay({ state }: { state: ExplorerState }) {
+export function chooseLength<O>(o: T.SingleOrLengthOpts<O>, length: "short" | "long"): O {
+    return ("long" in o) ? o[length] : o;
+}
+
+function SingleItemDisplay({ state }: { state: ExplorerState }) {
     if (state.subjectType === "pronouns") {
-        return <VerbTable
-            textOptions={opts}
-            block={makeBlockWPronouns(state.predicatesSelected[state.predicateType])}
-        />
+        return <div>ERROR: Wrong display being used</div>;
     }
     const entry = state.subjectsSelected[state.subjectType];
     // @ts-ignore - TODO: safer and for use with unisex nouns
@@ -32,13 +36,40 @@ function EquativeDisplay({ state }: { state: ExplorerState }) {
         } : {},
     } : entry;
 
-    const eq = assembleEquativeOutput(
-        equativeMachine(subjInput, state.predicatesSelected[state.predicateType])
+    const block = assembleEquativeOutput(
+        equativeMachine(subjInput, state.predicatesSelected[state.predicateType], state.tense)
     );
-    if ("short" in eq) return <div>length options not supported yet</div>;
     return <div>
-        <VerbTable textOptions={opts} block={eq} />
+        <VerbTable textOptions={opts} block={chooseLength(block, state.length)} />
     </div>;
 }
 
-export default EquativeDisplay;
\ No newline at end of file
+function PronounBlockDisplay({ state }: { state: ExplorerState }) {
+    const block = makeBlockWPronouns(state.predicatesSelected[state.predicateType], state.tense);
+    return <VerbTable
+        textOptions={opts}
+        block={chooseLength(block, state.length)}
+    />;
+}
+
+function EquativeDisplay({ state, dispatch }: { state: ExplorerState, dispatch: (action: ExplorerReducerAction) => void }) {
+    return <>
+        {state.tense === "past" && <div className="text-center">
+            <ButtonSelect
+                small
+                options={[
+                    { label: "Long", value: "long" },
+                    { label: "Short", value: "short" },
+                ]}
+                value={state.length}
+                handleChange={(p) => dispatch({ type: "setLength", payload: p as "long" | "short" })}
+            />
+        </div>}
+        {state.subjectType === "pronouns" 
+            ? <PronounBlockDisplay state={state} /> 
+            : <SingleItemDisplay state={state} />
+        }
+    </>;
+}
+
+export default EquativeDisplay;
diff --git a/src/components/equative-explorer/EquativeExplorer.tsx b/src/components/equative-explorer/EquativeExplorer.tsx
index 708fb94..5350bbe 100644
--- a/src/components/equative-explorer/EquativeExplorer.tsx
+++ b/src/components/equative-explorer/EquativeExplorer.tsx
@@ -5,6 +5,7 @@ import {
 import {
     PredicateSelector,
     SubjectSelector,
+    TenseSelector,
 } from "./explorer-selectors";
 import {
     ExplorerState,
@@ -18,9 +19,9 @@ import {
 } from "./explorer-inputs";
 import EquativeDisplay from "./EquativeDisplay";
 
-// TODO: Plural nouns like shoode
-
 const defaultState: ExplorerState = {
+    tense: "present",
+    length: "short",
     predicatesSelected: {
         adjective: defaultAdjective,
         unisexNoun: defaultUnisexNoun,
@@ -45,11 +46,12 @@ function EquativeExplorer() {
         unsafeSetState(newState);
     }
     return <>
-        <div className="d-flex flex-row justify-content-between align-items-center">
+        <TenseSelector state={state} dispatch={dispatch} />
+        <div className="d-flex flex-row justify-content-between align-items-center mt-2">
             <SubjectSelector state={state} dispatch={dispatch} />
             <PredicateSelector state={state} dispatch={dispatch} />
         </div>
-        <EquativeDisplay state={state} />
+        <EquativeDisplay state={state} dispatch={dispatch} />
     </>;
 }
 
diff --git a/src/components/equative-explorer/explorer-helpers.ts b/src/components/equative-explorer/explorer-helpers.ts
index efd7dfc..41f11e5 100644
--- a/src/components/equative-explorer/explorer-helpers.ts
+++ b/src/components/equative-explorer/explorer-helpers.ts
@@ -9,16 +9,27 @@ import {
     ParticipleInput,
     isParticipleInput,
     getEnglishParticiple,
+    TenseInput,
 } from "../../lib/equative-machine";
 
 export function sort<T extends (Adjective | Noun | ParticipleInput)>(arr: Readonly<T[]>): T[] {
     return [...arr].sort((a, b) => a.p.localeCompare(b.p));
 }
 
-export function makeBlockWPronouns(e: Adjective | UnisexNoun): T.VerbBlock {
+export function makeBlockWPronouns(e: Adjective | UnisexNoun, tense: TenseInput, length?: "short" | "long"): T.SingleOrLengthOpts<T.VerbBlock> {
+    if (tense === "past" && !length) {
+        return {
+            short: makeBlockWPronouns(e, tense, "short") as T.VerbBlock,
+            long: makeBlockWPronouns(e, tense, "long") as T.VerbBlock,
+        };
+    }
     const makeP = (p: T.Person): T.ArrayOneOrMore<T.PsString> => {
-        const b = assembleEquativeOutput(equativeMachine(p, e));
-        return ("long" in b ? b.long : b) as T.ArrayOneOrMore<T.PsString>;
+        const b = assembleEquativeOutput(equativeMachine(p, e, tense));
+        if ("long" in b) {
+            if (!length) throw new Error("bad length processing");
+            return b[length];
+        }    
+        return b;
     };
     return [
         [makeP(0), makeP(6)],
diff --git a/src/components/equative-explorer/explorer-reducer.ts b/src/components/equative-explorer/explorer-reducer.ts
index e248d2c..8980c2b 100644
--- a/src/components/equative-explorer/explorer-reducer.ts
+++ b/src/components/equative-explorer/explorer-reducer.ts
@@ -53,14 +53,26 @@ export function reducer(state: ExplorerState, action: ExplorerReducerAction): Ex
             },
         };
     }
+    if (action.type === "setSubjectGender") {
+        return {
+            ...state,
+            subjectsSelected: {
+                ...state.subjectsSelected,
+                info: {
+                    ...state.subjectsSelected.info,
+                    gender: action.payload,
+                },
+            },
+        };
+    }
+    if (action.type === "setTense") {
+        return {
+            ...state,
+            tense: action.payload,
+        };
+    }
     return {
         ...state,
-        subjectsSelected: {
-            ...state.subjectsSelected,
-            info: {
-                ...state.subjectsSelected.info,
-                gender: action.payload,
-            },
-        },
+        length: action.payload,
     };
 }
\ No newline at end of file
diff --git a/src/components/equative-explorer/explorer-selectors.tsx b/src/components/equative-explorer/explorer-selectors.tsx
index 6af6cfd..c64898c 100644
--- a/src/components/equative-explorer/explorer-selectors.tsx
+++ b/src/components/equative-explorer/explorer-selectors.tsx
@@ -204,3 +204,27 @@ export function PredicateSelector({ state, dispatch }: {
     </div>;
 }
 
+export function TenseSelector({ state, dispatch }: {
+    state: ExplorerState,
+    dispatch: (action: ExplorerReducerAction) => void,
+}) {
+    const options = [
+        { value: "present", label: "Present" },
+        { value: "past", label: "Past" },
+    ];
+    function onTenseSelect({ value }: any) {
+        dispatch({ type: "setTense", payload: value });
+    }
+    return <div>
+        <h5>Tense:</h5>
+        <Select
+            value={state.tense}
+            onChange={onTenseSelect}
+            className="mb-2"
+            // @ts-ignore
+            options={options}
+            placeholder={options.find(o => o.value === state.tense)?.label}
+            {...zIndexProps}
+        />
+    </div>
+}
diff --git a/src/components/equative-explorer/explorer-types.ts b/src/components/equative-explorer/explorer-types.ts
index 0e66da1..7849543 100644
--- a/src/components/equative-explorer/explorer-types.ts
+++ b/src/components/equative-explorer/explorer-types.ts
@@ -1,10 +1,12 @@
 import { Types as T } from "@lingdocs/pashto-inflector";
-import { ParticipleInput } from "../../lib/equative-machine";
+import { ParticipleInput, TenseInput } from "../../lib/equative-machine";
 
 export type PredicateType = keyof PredicatesSelected;
 export type SubjectType = "noun" | "pronouns" | "participle" | "unisexNoun";
 
 export type ExplorerState = {
+    tense: TenseInput,
+    length: "short" | "long",
     subjectType: SubjectType,
     subjectsSelected: SubjectSelected,
     predicateType: PredicateType,
@@ -36,4 +38,8 @@ export type ExplorerReducerAction = {
     type: "setSubjectPlural", payload: boolean,
 } | {
     type: "setSubjectGender", payload: T.Gender,
+} | {
+    type: "setTense", payload: TenseInput,
+} | {
+    type: "setLength", payload: "short" | "long",
 };
\ No newline at end of file
diff --git a/src/content/equatives/equative-explorer.mdx b/src/content/equatives/equative-explorer.mdx
index 41c5751..a1fae47 100644
--- a/src/content/equatives/equative-explorer.mdx
+++ b/src/content/equatives/equative-explorer.mdx
@@ -3,8 +3,5 @@ title: Equative Explorer 🌎
 ---
 
 import EquativeExplorer from "../../components/equative-explorer/EquativeExplorer";
-import Link from "../../components/Link";
-
-This currently only works with <Link to="/equatives/present-equative/">present equatives</Link>.  More coming soon... 👷‍♂️
 
 <EquativeExplorer />
diff --git a/src/lib/equative-machine.test.ts b/src/lib/equative-machine.test.ts
index 94bd8bf..9995c19 100644
--- a/src/lib/equative-machine.test.ts
+++ b/src/lib/equative-machine.test.ts
@@ -5,6 +5,7 @@ import {
     PredicateInput,
     ParticipleInput,
     assembleEquativeOutput,
+    TenseInput,
 } from "./equative-machine";
 import {
     Types as T,
@@ -45,6 +46,7 @@ const abilities: {
         in: {
             subject: SubjectInput,
             predicate: PredicateInput,
+            tense: TenseInput,
         },
         out: EquativeMachineOutput,
     }[],
@@ -57,6 +59,7 @@ const abilities: {
                 in: {
                     subject: T.Person.FirstSingMale,
                     predicate: {"ts":1527815306,"i":7530,"p":"ستړی","f":"stúRey","g":"stuRey","e":"tired","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "زه", f: "zu", e: "I (m.)" }],
@@ -68,6 +71,7 @@ const abilities: {
                 in: {
                     subject: T.Person.SecondPlurFemale,
                     predicate: {"ts":1527815306,"i":7530,"p":"ستړی","f":"stúRey","g":"stuRey","e":"tired","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "تاسو", f: "táaso", e: "You (f. pl.)" }, { p: "تاسې", f: "táase", e: "You (f. pl.)"}],
@@ -80,6 +84,7 @@ const abilities: {
                 in: {
                     subject: T.Person.ThirdSingFemale,
                     predicate: {"ts":1527812798,"i":5595,"p":"خفه","f":"khufa","g":"khufa","e":"sad, upset, angry; choked, suffocated","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "هغه", f: "haghá", e: "She/it (f.)" }],
@@ -96,6 +101,7 @@ const abilities: {
                 in: {
                     subject: T.Person.FirstSingFemale,
                     predicate: {"ts":1591872915426,"i":696,"p":"افغانی","f":"afghaanéy","g":"afghaaney","e":"Afghan (person)","c":"n. m. anim. unisex"} as UnisexNoun,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "زه", f: "zu", e: "I (f.)" }],
@@ -107,6 +113,7 @@ const abilities: {
                 in: {
                     subject: T.Person.FirstPlurFemale,
                     predicate: {"ts":1591872915426,"i":696,"p":"افغانی","f":"afghaanéy","g":"afghaaney","e":"Afghan (person)","c":"n. m. anim. unisex"} as UnisexNoun,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "مونږ", f: "moonG", e: "We (f. pl.)" }, { p: "موږ", f: "mooG", e: "We (f. pl.)" }],
@@ -121,6 +128,7 @@ const abilities: {
                 in: {
                     subject: T.Person.FirstPlurFemale,
                     predicate: {"ts":1527814779,"i":935,"p":"انسان","f":"insaan","g":"insaan","e":"human, person","c":"n. m. anim. unisex"} as UnisexNoun,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "مونږ", f: "moonG", e: "We (f. pl.)" }, { p: "موږ", f: "mooG", e: "We (f. pl.)" }],
@@ -132,6 +140,7 @@ const abilities: {
                 in: {
                     subject: T.Person.SecondSingFemale,
                     predicate: {"ts":1527814779,"i":935,"p":"انسان","f":"insaan","g":"insaan","e":"human, person","c":"n. m. anim. unisex"} as UnisexNoun,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "ته", f: "tu", e: "You (f.)" }],
@@ -151,6 +160,7 @@ const abilities: {
                         plural: false,
                     },
                     predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "کتاب", f: "kitáab", e: "(A/The) book" }],
@@ -165,6 +175,7 @@ const abilities: {
                         plural: true,
                     },
                     predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "کتابونه", f: "kitaabóona", e: "(The) books" }],
@@ -179,6 +190,7 @@ const abilities: {
                         plural: false,
                     },
                     predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "ښځه", f: "xúdza", e: "(A/The) woman" }],
@@ -193,6 +205,7 @@ const abilities: {
                         plural: true,
                     },
                     predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "ښځې", f: "xúdze", e: "(The) women" }],
@@ -208,6 +221,7 @@ const abilities: {
                         plural: true,
                     },
                     predicate: {"ts":1527812798,"i":5595,"p":"خفه","f":"khufa","g":"khufa","e":"sad, upset, angry; choked, suffocated","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "ښځې", f: "xúdze", e: "(The) women" }],
@@ -227,6 +241,7 @@ const abilities: {
                         plural: true,
                     },
                     predicate: {"ts":1527812796,"i":8578,"p":"ښه","f":"xu","g":"xu","e":"good","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "شودې", f: "shoodé", e: "(The) milk" }],
@@ -241,6 +256,7 @@ const abilities: {
                         plural: true,
                     },
                     predicate: {"ts":1527815451,"i":7192,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "غنم", f: "ghanúm", e: "(The) wheat" }],
@@ -257,6 +273,7 @@ const abilities: {
                 in: {
                     subject: {"ts":1527812790,"i":5747,"p":"خوړل","f":"khoRul","g":"khoRul","e":"to eat, to bite","c":"v. trans.","psp":"خور","psf":"khor","tppp":"خوړ","tppf":"khoR","ec":"eat"} as ParticipleInput,
                     predicate: {"ts":1527812796,"i":8578,"p":"ښه","f":"xu","g":"xu","e":"good","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "خوړل", f: "khoRul", e: "eating" }],
@@ -268,6 +285,7 @@ const abilities: {
                 in: {
                     subject: {"ts":1527817298,"i":310,"p":"اخیستل","f":"akheestul","g":"akheestul","e":"to take, buy, purchase, receive; to shave, cut with scissors","c":"v. trans.","psp":"اخل","psf":"akhl","ec":"take,takes,taking,took,taken"} as ParticipleInput,
                     predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "اخیستل", f: "akheestul", e: "taking" }],
@@ -279,6 +297,7 @@ const abilities: {
                 in: {
                     subject: {"ts":1527816854,"i":4365,"p":"جګېدل","f":"jugedul, jigedul","g":"jugedul,jigedul","e":"to get up, be raised up","c":"v. stat. comp. intrans.","l":1527812707,"ec":"get, gets, getting, got, gotten","ep":"up"} as ParticipleInput,
                     predicate: {"ts":1527815246,"i":7591,"p":"سخت","f":"sakht","g":"sakht","e":"hard, difficult","c":"adj."} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "جګېدل", f: "jugedul", e: "getting up" }],
@@ -295,6 +314,7 @@ const abilities: {
                 in: {
                     subject: T.Person.SecondSingMale,
                     predicate: {"ts":1527812856,"i":11521,"p":"لیکل","f":"leekul","g":"leekul","e":"to write","c":"v. trans.","ec":"write,writes,writing,wrote,wrote"} as ParticipleInput,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "ته", f: "tu", e: "You (m.)" }],
@@ -317,6 +337,7 @@ const abilities: {
                         entry: {"ts":1527812788,"i":5729,"p":"خوراک","f":"khoráak, khwaráak","g":"khoraak,khwaraak","e":"food","c":"n. m."} as SingularEntry<Noun>,
                         plural: false,
                     },
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "خوشحالي", f: "khosh`haalee", e: "(A/The) happiness" }],
@@ -336,6 +357,7 @@ const abilities: {
                         plural: false,
                     },
                     predicate: {"ts":1527816064,"i":7097,"p":"زغمل","f":"zghamul","g":"zghamul","e":"to endure, bear, tolerate, take on, digest","c":"v. trans.","tppp":"زغامه","tppf":"zghaamu","ec":"endure"} as ParticipleInput,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "وروروالی", f: "wrorwaaley", e: "(A/The) brotherhood" }],
@@ -355,6 +377,7 @@ const abilities: {
                         entry: {"ts":1527813477,"i":5790,"p":"خوشحالي","f":"khosh`haalee","g":"khoshhaalee","e":"happiness, joy","c":"n. f."} as SingularEntry<Noun>,
                         plural: false,
                     },
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "لیکل", f: "leekul", e: "writing" }],
@@ -371,6 +394,7 @@ const abilities: {
                 in: {
                     subject: {"ts":1527812856,"i":11521,"p":"لیکل","f":"leekul","g":"leekul","e":"to write","c":"v. trans.","ec":"write,writes,writing,wrote,wrote"} as ParticipleInput,
                     predicate: {"ts":1577394057681,"i":2784,"p":"پوهېدل","f":"pohedul","g":"pohedul","e":"to understand (to come to a state of understanding)","c":"v. stat. comp. intrans.","l":1527811469,"ec":"understand,understand,understanding,understood"} as ParticipleInput,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "لیکل", f: "leekul", e: "writing" }],
@@ -394,6 +418,7 @@ const abilities: {
                         plural: false,
                         gender: "fem",
                     },
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "کتابونه", f: "kitaabóona", e: "(The) books" }],
@@ -414,6 +439,7 @@ const abilities: {
                         gender: "fem",
                     },
                     predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "present",
                 },
                 out: {
                     subject: [
@@ -440,6 +466,7 @@ const abilities: {
                         entry: {"ts":1527812817,"i":9921,"p":"کتاب","f":"kitáab","g":"kitaab","e":"book","c":"n. m."} as SingularEntry<Noun>,
                         plural: true,
                     },
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "نرسه", f: "narsa", e: "(A/The) nurse" }],
@@ -460,6 +487,7 @@ const abilities: {
                         gender: "fem",
                     },
                     predicate: {"ts":1527813680,"i":9131,"p":"غږېدل","f":"ghuGedul, ghaGedul","g":"ghugedul,ghagedul","e":"to converse, speak, talk, sing","c":"v. intrans.","ec":"speak,speaks,speaking,spoke"} as ParticipleInput,
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "نرسه", f: "narsa", e: "(A/The) nurse" }],
@@ -480,6 +508,7 @@ const abilities: {
                         plural: false,
                         gender: "fem",
                     },
+                    tense: "present",
                 },
                 out: {
                     subject: [{ p: "لیکل", f: "leekul", e: "writing" }],
@@ -489,13 +518,36 @@ const abilities: {
             },
         ],
     },
+    {
+        label: "Past tense",
+        tests: [
+            {
+                in: {
+                    subject: {
+                        entry: { "ts":1527812817,"i":9921,"p":"کتاب","f":"kitáab","g":"kitaab","e":"book","c":"n. m." } as SingularEntry<Noun>,
+                        plural: false,
+                    },
+                    predicate: {"ts":1527815451,"i":7193,"p":"زوړ","f":"zoR","g":"zoR","e":"old","c":"adj. irreg.","infap":"زاړه","infaf":"zaaRu","infbp":"زړ","infbf":"zaR"} as Adjective,
+                    tense: "past",
+                },
+                out: {
+                    subject: [{ p: "کتاب", f: "kitáab", e: "(A/The) book" }],
+                    predicate: [{ p: "زوړ", f: "zoR", e: "old" }],
+                    equative: {
+                        short: [{ p: "و", f: "wo", e: "was" }],
+                        long: [{ p: "ولو", f: "wulo", e: "was" }],
+                    },
+                },
+            },
+        ],
+    },
 ];
 
 describe("equativeMachine", () => {
     abilities.forEach((a) => {
         test(a.label, () => {
             a.tests.forEach((t) => {
-                expect(equativeMachine(t.in.subject, t.in.predicate)).toEqual(t.out);
+                expect(equativeMachine(t.in.subject, t.in.predicate, t.in.tense)).toEqual(t.out);
             });
         });
     });
@@ -520,4 +572,15 @@ test("assembleEquativeOutput", () => {
         { p: "موږ افغانیانې یو", f: "mooG afghaaniyáane yoo", e: "We (f. pl.) are (the) Afghans" },
         { p: "موږ افغانۍ یو", f: "mooG afghaanúy yoo", e: "We (f. pl.) are (the) Afghans" },
     ]);
+    expect(assembleEquativeOutput({
+        subject: [{ p: "کتاب", f: "kitáab", e: "(A/The) book" }],
+        predicate: [{ p: "زوړ", f: "zoR", e: "old" }],
+        equative: {
+            short: [{ p: "و", f: "wo", e: "was" }],
+            long: [{ p: "ولو", f: "wulo", e: "was" }],
+        },
+    })).toEqual({
+        short: [{ p: "کتاب زوړ و", f: "kitáab zoR wo", e: "(A/The) book was old" }],
+        long: [{ p: "کتاب زوړ ولو", f: "kitáab zoR wulo", e: "(A/The) book was old" }],
+    });
 });
\ No newline at end of file
diff --git a/src/lib/equative-machine.ts b/src/lib/equative-machine.ts
index 3672b26..73e293c 100644
--- a/src/lib/equative-machine.ts
+++ b/src/lib/equative-machine.ts
@@ -38,8 +38,9 @@ export type PersonInput = T.Person;
 export type EntityInput = SubjectInput | PredicateInput;
 export type SubjectInput = PersonInput | NounInput | ParticipleInput | SpecifiedUnisexNounInput;
 export type PredicateInput = PersonInput | NounInput | Adjective | SpecifiedUnisexNounInput | UnisexNoun | ParticipleInput;
+export type TenseInput = "present" | "past";
 
-export function equativeMachine(sub: SubjectInput, pred: PredicateInput): EquativeMachineOutput {
+export function equativeMachine(sub: SubjectInput, pred: PredicateInput, tense: TenseInput = "present"): EquativeMachineOutput {
     // - english equative always agrees with subject
     // - pashto equative agrees with predicate, unless it's an adjective, in which case the
     // agreement reverts to the subject
@@ -47,7 +48,7 @@ export function equativeMachine(sub: SubjectInput, pred: PredicateInput): Equati
     const predPerson = getInputPerson(pred, "predicate") || subjPerson;
     const subject = makeEntity(sub);
     const predicate = makeEntity(pred, subjPerson);
-    const equative = makeEquative(subjPerson, predPerson, sub);
+    const equative = makeEquative(subjPerson, predPerson, sub, tense);
     return {
         subject,
         predicate,
@@ -120,7 +121,7 @@ function makeEntity(e: EntityInput, subjPerson?: T.Person): T.PsString[] {
     throw new Error(`invalid entity in ${subjPerson ? "predicate" : "subject"}`);
 }
 
-function makeEquative(subj: T.Person, pred: T.Person, subjectInput: SubjectInput): T.SentenceForm {
+function makeEquative(subj: T.Person, pred: T.Person, subjectInput: SubjectInput, tense: TenseInput): T.SentenceForm {
     const isPluralNoun = isNounInput(subjectInput) && isPluralEntry(subjectInput.entry);
     // The subject's person information, for the English equative
     const [eeRow, eeCol] = getVerbBlockPosFromPerson(
@@ -129,9 +130,9 @@ function makeEquative(subj: T.Person, pred: T.Person, subjectInput: SubjectInput
             : subj
         );
     return addEnglish(
-        grammarUnits.englishEquative.present[eeRow][eeCol],
+        grammarUnits.englishEquative[tense][eeRow][eeCol],
         // pashto agrees with predicate (if possible)
-        getPersonFromVerbForm(grammarUnits.equativeEndings.present, pred),
+        getPersonFromVerbForm(grammarUnits.equativeEndings[tense], pred),
     );
 }