Future Vowel: יִכְתּוֹב vs יִלְמַד vs יִשְׁמַע | Hebrew Grammar

Every learner of Hebrew meets this within a fortnight of learning the pa'al future and almost no textbook answers it: why is it יִכְתּוֹב but יִלְמַד, and יִשְׁמַע rather than yishmór? The vowel between the second and third root letters — the theme vowel — comes in two versions, and the choice between them is partly rule and partly lexicon. Here is the whole picture, in the order of usefulness.

Clause one: the cholam is the default

With no guttural anywhere in the root, the ordinary theme vowel is cholam:

Root	Future (he)	Written	Root	Future (he)	Written
כ־ת־ב	יִכְתּוֹב yikhtóv	יכתוב	ז־כ־ר	יִזְכּוֹר yizkór	יזכור
שׁ־מ־ר	יִשְׁמוֹר yishmór	ישמור	ב־ד־ק	יִבְדּוֹק yivdók	יבדוק
ס־ג־ר	יִסְגּוֹר yisgór	יסגור	ז־ר־ק	יִזְרוֹק yizrók	יזרוק
ג־מ־ר	יִגְמוֹר yigmór	יגמור	ד־ר־שׁ	יִדְרוֹשׁ yidrósh	ידרוש

תזכור לסגור את הגז לפני שאתה יוצא.

tizkór lisgór et hagáz lifnéi she'atá yotsé

Remember to turn the gas off before you leave. (to a man)

Clause two: a guttural forces a patach

If א, ח or ע is the second or the third root letter — or ה in second position — the theme vowel is a patach. This one is a genuine rule: the vowel is not a choice at all but a consequence of what a guttural does to the vowel beside it. A ה in third position is a different animal and is not covered here; those roots are the ל״ה verbs, which lose the ה altogether and end in a segol (יִרְאֶה, יִבְנֶה), outside this split entirely.

Guttural in the middle	Guttural at the end
שׁ־א־ל → יִשְׁאַל yish'ál	שׁ־מ־ע → יִשְׁמַע yishmá
ב־ח־ר → יִבְחַר yivkhár	שׁ־ל־ח → יִשְׁלַח yishlákh
צ־ע־ק → יִצְעַק yits'ák	פ־ת־ח → יִפְתַּח yiftákh
נ־ה־ג → יִנְהַג yinhág	ב־ר־ח → יִבְרַח yivrákh

A root ending in א takes the same a, written with a kamatz rather than a patach because the א has given up its consonantal value and the a lengthens into the space it leaves: מ־צ־א gives יִמְצָא yimtsá, ק־ר־א gives יִקְרָא yikrá, צ־מ־א gives יִצְמָא yitsmá.

💡

ר is not a guttural for this purpose. Textbooks that list "the gutturals" as א ה ח ע ר blur two different facts: ר behaves like a guttural for dagesh (it refuses one, which is why nif'al and pi'el reshape around it) and not at all for this vowel. So יִדְרוֹשׁ, יִזְרוֹק and יִשְׂרוֹף keep their cholam, and a learner who counts the ר produces *yizrák* for a verb nobody pronounces that way.

תשאל אותו, הוא בטוח יודע.

tish'ál otó, hu batúakh yodéa

Ask him — he's bound to know. (to a man)

אל תצעק, אני שומע אותך מצוין.

al tits'ák, aní shoméa otkhá metsuyán

Don't shout, I can hear you perfectly. (to a man)

אני אקרא את זה בערב ואגיד לך מה דעתי.

aní ekrá et ze ba'érev ve'agíd lekhá ma da'atí

I'll read it this evening and tell you what I think. (to a man)

Clause three: the residue, which is lexical

Then there is a group with no guttural in sight and a patach anyway:

Root	Future	Written	Meaning
ל־מ־ד	יִלְמַד yilmád	ילמד	learn
ל־ב־שׁ	יִלְבַּשׁ yilbásh	ילבש	put on, wear
שׁ־כ־ב	יִשְׁכַּב yishkáv	ישכב	lie down
ר־כ־ב	יִרְכַּב yirkáv	ירכב	ride
ג־ד־ל	יִגְדַּל yigdál	יגדל	grow
י־שׁ־ן	יִישַׁן yishán	יישן	sleep

There is no shortcut here, and it is worth saying so plainly. You cannot read the class off the meaning: לָמַד "learn" and לָבַשׁ "put on" are as active as כָּתַב, and they are in the a-class, while סָגַר and זָכַר are in the o-class. The vowel is a property of the individual verb, learned with the verb — the same way a German noun's gender is.

What does help is that the group has a centre of gravity. Most of the stative verbs — the ones naming a condition rather than an act: ישן, גדל, זקן, רעב — are in it, which is why conjugation dictionaries label the whole a-class "stative". Treat that label as a name for the vowel, not as a claim about the meaning, and it will stop misleading you at למד.

היא תלמד רפואה, היא כבר החליטה.

hi tilmád refu'á, hi kvar hekhlíta

She's going to study medicine, she's already decided.

תלבש משהו חם, בחוץ קפוא.

tilbásh máshehu kham, bakhúts kafú

Put something warm on, it's freezing out. (to a man)

אני לא אשכב לישון לפני שהם חוזרים.

aní lo eshkáv lishón lifnéi shehém khozrím

I'm not going to bed before they get back.

How far the split reaches

The imperative goes with the future, because it is built from it: strip the ת off תִּכְתּוֹב and you get כְּתוֹב, strip it off תִּלְמַד and you get לְמַד.

Future	Imperative (to a man)
תִּכְתּוֹב	כְּתוֹב ktov
תִּשְׁמוֹר	שְׁמוֹר shmor
תִּלְמַד	לְמַד lemád
תִּשְׁמַע	שְׁמַע shmá
תִּבְחַר	בְּחַר bekhár

The infinitive does not. Its theme vowel is a cholam even where the future has a patach: יִלְמַד but ללמוד, יִשְׁמַע but לשמוע, יִלְבַּשׁ but ללבוש, יִגְדַּל but לגדול. A few verbs do carry the patach through — לִשְׁכַּב lishkáv is the one you meet first, לִרְכַּב the other (dictionaries print לרכוב beside it) — but they are a short list, not a second class. The full treatment is on the pa'al infinitive.

בחר מה שאתה רוצה, אני משלם.

bekhár ma she'atá rotsé, aní meshalém

Pick whatever you want, I'm paying. (to a man — a true imperative, neutral to slightly formal)

The spelling gives it away

Here is the practical payoff, and most sources never mention it. In ktiv male an o has to be written with a vav and an a is written with nothing. So the unpointed future tells you its own vowel:

Has a vav between the 2nd and 3rd root letters	Has none
יכתוב, ישמור, יסגור, יגמור, יבדוק, יזרוק	ילמד, ישמע, ישאל, ילבש, יפתח, יגדל
= cholam, yikhtóv	= patach, yilmád

Two conditions on reading it. It has to be the vav in that position — אוכל and אומר (first-person okhál, omár) are written with a vav that spells the prefix vowel, and both verbs are in the a-class anyway, on account of the א that opens the root; look at the third-person יאכל and יאמר and the test works again. And it applies only to three-consonant roots that keep all three consonants: in יבוא, יקום and יגור the vav is the middle root letter, and ל״ה verbs (יִרְאֶה, יִבְנֶה) are outside the split altogether.

Sort these ten

Cover the right-hand column and classify each by spelling alone.

Written	Reading	Written	Reading
יגמור	yigmór — o	יבדוק	yivdók — o
ישאל	yish'ál — a	יפתח	yiftákh — a
יזכור	yizkór — o	יזרוק	yizrók — o
ישמע	yishmá — a	ילבש	yilbásh — a
ילמד	yilmád — a	ישלח	yishlákh — a

Four of the ten carry a vav and are therefore o-verbs; the other six are a-verbs. Note how little the meaning contributed: יזרוק and ילבש are both plain physical actions and they land on opposite sides.

Common Mistakes

1. Giving a guttural verb a cholam. The commonest error on this page by a distance, because the ordinary pattern is learned first and ח and ע are inaudible in Israeli Hebrew.

❌ הוא לא ישמוע אותך מהחדר השני

Incorrect — a root ending in ע takes a patach and no vav: הוא לא ישמע אותך, yishmá. The vav belongs to the infinitive לשמוע, not to the future.

✅ הוא לא ישמע אותך מהחדר השני, תרים את הקול.

hu lo yishmá otkhá mehakhéder hashení, tarím et hakól

He won't hear you from the other room, speak up. (to a man)

2. Giving a residue-class verb a cholam. Here nothing in the root warns you, which is exactly why the class has to be learned verb by verb.

❌ אני אלבוש את החולצה החדשה

Incorrect — לבש is in the a-class: אני אלבש את החולצה החדשה, elbásh. Its infinitive does have the vav — ללבוש — which is what misleads people.

✅ אני אלבש את החולצה החדשה שקנינו אתמול.

aní elbásh et hakhultsá hakhadashá shekanínu etmól

I'll wear the new shirt we bought yesterday.

3. Counting ר as a guttural. The rule is about א, ה, ח and ע only.

❌ יזרוק, ידרוש, ישרוף

yizrák · yidrásh · yisráf

Incorrect as readings — the spellings are right, the vowels are not. ר does not trigger the patach; all three keep the cholam, and the vav in the spelling says so: yizrók, yidrósh, yisróf.

4. Treating a silent א as no letter at all. In ל״א roots the א is unpronounced but fully present, and it takes the a-vowel with it.

❌ אני אמצוא את זה עד מחר

Incorrect — מצא ends in א, so the future is אֶמְצָא with a kamatz and no vav: אני אמצא את זה עד מחר, emtsá.

✅ אני אמצא את זה עד מחר, אל תדאגי.

aní emtsá et ze ad makhár, al tid'agí

I'll find it by tomorrow, don't worry. (to a woman)

Key Takeaways

The pa'al future has two theme vowels: cholam (יִכְתּוֹב) and patach (יִלְמַד).
Cholam is the default for a root with no guttural: יִשְׁמוֹר, יִסְגּוֹר, יִגְמוֹר, יִזְכּוֹר, יִבְדּוֹק.
א, ח or ע as the second or third radical forces the patach — and so does ה as the second: יִשְׁאַל, יִבְחַר, יִנְהַג, יִשְׁמַע, יִשְׁלַח, יִפְתַּח. A final א writes the same vowel with a kamatz: יִמְצָא, יִקְרָא. A final ה is not in this game at all — those are the ל״ה verbs, יִרְאֶה, יִבְנֶה.
ר is not a guttural here. יִדְרוֹשׁ, יִזְרוֹק, יִשְׂרוֹף keep the cholam.
A residue class takes the patach with no guttural at all — ילמד, ילבש, ישכב, ירכב, יגדל, יישן — and it is lexical: you cannot predict it from the meaning. Most statives are in it.
The imperative follows the future (כְּתוֹב against לְמַד, שְׁמַע, בְּחַר); the infinitive does not (יִלְמַד but ללמוד, יִשְׁמַע but לשמוע), with לִשְׁכַּב and לִרְכַּב as the short list of verbs that carry the patach through.
The ktiv male spelling is the test: a vav between the second and third root letters means cholam, no vav means patach — reading it on the third-person form, and only for roots that keep all three consonants.

Now practice Hebrew

Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.

Start learning Hebrew →