Learners recognise התחיל, learn להתחיל, and then fail to recognise מתחיל as the same verb. The ה is why: it is a prefix rather than a root letter, and it is visible in some forms and gone in others. This page is about nothing else, because once the alternation is a single rule it stops being four things to memorise.
Four forms of one verb
| Form | Pointed | Written | Reading | What holds the slot |
|---|---|---|---|---|
| past (הוא) | הִתְחִיל | התחיל | hitkhíl | ה |
| present (m. sg.) | מַתְחִיל | מתחיל | matkhíl | מ |
| future (הוא) | יַתְחִיל | יתחיל | yatkhíl | י |
| infinitive | לְהַתְחִיל | להתחיל | lehatkhíl | ה, after the ל |
The rule that generates all four
A Hebrew verb has one prefix slot, and hif'il's ה is one of three things that can occupy it. The present insists on a מ — that is how Hebrew builds a participle in every binyan except pa'al and nif'al — and the future insists on a person letter: א for I, ת for you and she, י for he and they, נ for we. Neither will share the position, so there the ה is pushed out.
The past has no competitor, so the ה stays. The infinitive's ל־ is a preposition rather than a prefix — it stacks in front of the whole word instead of taking the slot — so the ה stays there too, and so does the imperative's (הַתְחֵל, הַסְבֵּר). That is the whole alternation: the ה survives exactly where nothing else wants its position.
Notice too what the winner inherits. הַ־ carries a patach, and מ and the person letters take that same patach with them: מַתְחִיל, יַתְחִיל, תַּסְבִּירִי, נַזְמִין. The vowel belongs to the slot, not to the letter.
התחלנו בלי לחכות, כבר היה מאוחר.
hitkhálnu bli lekhakót, kvar hayá me'ukhár
We started without waiting — it was already late.
אני מתחילה עבודה חדשה בראשון.
aní matkhilá avodá khadashá barishón
I start a new job on Sunday. (f. speaker)
הם יתחילו בלעדינו אם לא נזדרז.
hem yatkhílu bil'adéinu im lo nizdaréz
They'll start without us if we don't get a move on.
אי אפשר להתחיל בלי החתימה שלו.
i efshár lehatkhíl bli hakhatimá sheló
We can't start without his signature.
The same four slots on four more roots
| Root | Past | Present | Future | Infinitive |
|---|---|---|---|---|
| ס־ב־ר explain | הִסְבִּיר | מַסְבִּיר | יַסְבִּיר | לְהַסְבִּיר |
| ר־ג־שׁ feel | הִרְגִּישׁ | מַרְגִּישׁ | יַרְגִּישׁ | לְהַרְגִּישׁ |
| ז־מ־ן invite, order | הִזְמִין | מַזְמִין | יַזְמִין | לְהַזְמִין |
| נ־ג־ע arrive | הִגִּיעַ | מַגִּיעַ | יַגִּיעַ | לְהַגִּיעַ |
Four roots, four identical front-of-word patterns: ה · מ · י · לה. The last row does something extra, and it is worth separating from the alternation this page is about. הגיע is פ״נ — its first radical נ has assimilated into the ג, which is what the dagesh in הִגִּיעַ marks. That happens inside the stem and has nothing to do with the prefix slot, which behaves exactly as it does in the other three rows.
תסביר לי שוב, לא תפסתי את הסוף.
tasbír li shuv, lo tafásti et hasóf
Explain it to me again — I didn't catch the end. (to a man)
מי מזמין את המונית?
mi mazmín et hamonít
Who's ordering the taxi?
הם יגיעו רק בשמונה, יש פקק בכניסה.
hem yagí'u rak bishmóne, yesh pkak baknisá
They won't get here till eight — there's a jam at the entrance.
The hollow roots do the same thing with different vowels
Do not let the rule look tidier than it is. The slot-filling is identical in ע״ו and ע״י roots; only the vowel that lives in the slot changes, from a patach to a tsere in the past and present and a kamatz in the future and infinitive.
| Root | Past | Present | Future | Infinitive |
|---|---|---|---|---|
| ת־ח־ל (for comparison) | הִתְחִיל hitkhíl | מַתְחִיל matkhíl | יַתְחִיל yatkhíl | לְהַתְחִיל lehatkhíl |
| ב־י־ן understand | הֵבִין hevín | מֵבִין mevín | יָבִין yavín | לְהָבִין lehavín |
עכשיו אני מבינה למה לא ענית.
akhsháv aní meviná láma lo aníta
Now I understand why you didn't answer. (f. speaker, to a man)
Reading it, and building it
To recognise: a מ at the front plus a long i written with a yod immediately before the last root letter means you are looking at a hif'il present — מתחיל, מסביר, מרגיש, מזמין, מגיע. That test is more reliable than listening for the stress, because the stress moves and the yod does not.
To build, work backwards from the infinitive, which is the form dictionaries and word lists give you:
| From לְהַסְבִּיר | Do this | Result |
|---|---|---|
| past | drop the ל | הסביר hisbír |
| present | swap the ה for a מ | מסביר masbír |
| future | swap the ה for א · ת · י · נ | אסביר · תסביר · יסביר · נסביר |
One qualification on the first row: dropping the ל gives you the written past, not its vowels. לְהַסְבִּיר minus the ל is הַסְבִּיר, and the past is הִסְבִּיר with a chirik — the same string unpointed, so the shortcut works on the page and needs a small correction in the mouth.
להתחיל beside להתלבש
Because the infinitive restores the ה, every hif'il infinitive opens לה־ — and so does every hitpa'el infinitive, for exactly the same reason. Unpointed, לְהַתְחִיל and לְהִתְלַבֵּשׁ look like the same construction, and the mechanism behind them really is the same; what differs is which letters fill the slot.
צריך להתחיל את הפגישה בזמן.
tsaríkh lehatkhíl et hapgishá bazmán
We need to start the meeting on time. (hif'il — לְהַ, patach)
צריך להתלבש חם, בחוץ שבע מעלות.
tsaríkh lehitlabésh kham, bakhúts shéva ma'alót
You'll want to dress warm — it's seven degrees out. (hitpa'el — לְהִ, chirik)
In להתלבש the ת belongs to the prefix: hitpa'el's marker is the whole syllable הִתְ, and the root is ל־ב־שׁ. In להתחיל the ת is the first letter of the root ת־ח־ל, and the ה in front of it is the ordinary hif'il ה. Same two letters on the page, two entirely different jobs — and the same is true of הִתְאִים "fits, suits" (ת־א־ם) and הִתְמִיד "persists" (ת־מ־ד), which are hif'il verbs and not hitpa'el ones.
What is not different is the disappearing ה. That is not a quirk of hif'il; hitpa'el does the identical thing. Its prefix is הִתְ in the past (הִתְלַבֵּשׁ) and in the infinitive (לְהִתְלַבֵּשׁ), and the ה drops out in exactly the two places hif'il's does — מִתְלַבֵּשׁ in the present, אֶתְלַבֵּשׁ · תִּתְלַבֵּשׁ · יִתְלַבֵּשׁ · נִתְלַבֵּשׁ in the future, with the ת of the prefix left behind. Nif'al does a version of it too: the ה is there in לְהִיכָּנֵס and in the imperative הִיכָּנֵס, and gone from נִכְנָס and יִיכָּנֵס. One slot, one rule, several binyanim — which is why a ה on an infinitive tells you nothing at all about which binyan you are in.
The vowels settle it instantly in any form you can hear. In the past, hif'il runs i–i and hitpa'el runs i–a–e: hitkhíl against hitlabésh. In the infinitive, hif'il runs a–i and hitpa'el i–a–e: lehatkhíl against lehitlabésh. The full set of look-alikes is on binyan confusion.
The spelling corollary
The hif'il prefix vowel is a chirik in הִתְחַלְתִּי and a tsere in הֵבַנְתִּי, and neither is written with a yod in ktiv male. So התחלתי, הרגשתי, הסברתי, הבנתי — never *היתחלתי. Nif'al is where that yod belongs — להיכנס, להירשם, and the future אֵירָדֵם written אירדם — and the habit spreads from there; the rules that separate the two cases are on ktiv male.
The one thing that legitimately puts a yod at the front of a hif'il is a root that begins with one: לְהֵיטִיב leheitív "to do good by" (formal) is י־ט־ב, and the yod is a root letter standing next to the prefix, not a spelling of the prefix vowel.
Common Mistakes
1. Building the infinitive off the present or the future. מתחיל and יתחיל both show the stem without the ה, so a learner strips the prefix and puts a ל in front of what is left.
❌ אני רוצה לתחיל מחר
Incorrect — the infinitive restores the ה: להתחיל. Pealim returns nothing for לתחיל. Same for להסביר, להרגיש, להזמין — never *לסביר.
✅ אני רוצה להתחיל מחר, אין טעם לחכות עוד שבוע.
aní rotsé lehatkhíl makhár, ein tá'am lekhakót od shavúa
I want to start tomorrow — there's no point waiting another week.
2. Carrying the infinitive's ה into the future. The mirror error: the learner takes להתחיל as the base and swaps only the ל.
❌ מתי הוא יהתחיל?
Incorrect — the person letter takes the ה's place rather than standing in front of it: מתי הוא יתחיל? Likewise תסביר, אזמין, נגיע — one prefix letter, never two.
✅ מתי הוא יתחיל לעבוד על זה בכלל?
matái hu yatkhíl la'avód al ze bikhlál?
When is he actually going to start working on this?
3. Writing the prefix vowel with a yod. Nif'al infinitives and futures take one, and the habit crosses over.
❌ הירגשתי
Incorrect as a spelling — the hif'il prefix vowel is never written with a yod: הרגשתי, התחלתי, הסברתי. The yod of להיכנס is nif'al's, and the yod of להיטיב is a root letter.
✅ התחלתי ללמוד עברית לפני שנה ואני עדיין מגמגם.
hitkhálti lilmód ivrít lifnéi shaná va'aní adáyin megamgém
I started learning Hebrew a year ago and I still stammer. (m. speaker)
4. Moving the stress onto the future ending. Every other Hebrew paradigm pulls the beat onto ־י and ־וּ; hif'il's future does not.
❌ יתחילו
yatkhilú
Incorrect — yatkhílu, with the stress on the stem, and likewise tatkhíli, tasbíri, yagí'u. The ending-stressed reading belongs to the present: matkhilá, matkhilím.
✅ הם יתחילו בשש, אז כדאי לצאת בחמש וחצי.
hem yatkhílu beshésh, az kedái latsét bekhamésh vakhétsi
They start at six, so we should leave at half five.
Key Takeaways
- A hif'il verb has one prefix slot. The ה holds it in the past, the infinitive and the imperative; מ takes it in the present; a person letter (א · ת · י · נ) takes it in the future.
- The ל־ of the infinitive is a preposition stacked in front, not a prefix — which is why the ה survives there: לְהַתְחִיל, not *לתחיל.
- Whatever fills the slot inherits its vowel: the patach of הַ־ reappears in מַתְחִיל, יַתְחִיל, תַּסְבִּירִי.
- Hollow roots fill the same slot with different vowels — tsere in הֵבִין and מֵבִין, kamatz in יָבִין and לְהָבִין.
- Recognition: מ + a long i written with a yod before the last root letter = hif'il present.
- Production: from the infinitive, drop the ל for the past spelling, swap the ה for מ for the present, swap it for א · ת · י · נ for the future.
- Present and future stress opposite ends: matkhilá / matkhilím against tatkhíli / yatkhílu.
- לה־ at the front is ambiguous. להתחיל is hif'il with ת as a root letter; להתלבש is hitpa'el with ת in the prefix. הִתְאִים and הִתְמִיד are hif'il too.
- The vanishing ה is not hif'il's alone. hitpa'el loses it in the same two places (מִתְלַבֵּשׁ, יִתְלַבֵּשׁ against לְהִתְלַבֵּשׁ), and nif'al in its own way (נִכְנָס, יִיכָּנֵס against לְהִיכָּנֵס). The slot rule is general; only the vowels tell the binyanim apart.
- No yod on the prefix vowel in ktiv male: התחלתי, הרגשתי. The yod in לְהֵיטִיב is a root letter.
Now practice Hebrew
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Hebrew →Related Topics
- Hif'il Present: מתחיל, מסביר, מרגישA2 — Four forms on the shape מַקְטִיל — a מ at the front, a silent shva after the first root letter, and a long i written with a yod before the last one. That yod is the recognition test, and it survives even in the two sub-classes where the prefix vowel changes.
- Hif'il Infinitive (להתחיל) and ImperativeA2 — The infinitive is where the ה comes back — לְהַתְחִיל, not the form a learner would predict from מַתְחִיל. The imperative is הַתְחֵל with a tsere, and honestly it is a reading skill rather than a speaking one: Israelis command with the future.
- Hitpa'el Present: מתלבש, מסתכל, מתרגשA2 — Four forms, one syllable of prefix, and a stress pattern English speakers get wrong on the first try — plus the מ־ table that finally separates מתלבש from מתחיל, which is the pair learners actually fail on.
- בניין הפעיל: Causative and Much MoreA2 — Hif'il is the third of the everyday active binyanim, and the one whose ה prefix keeps vanishing: it is there in הִתְחִיל, gone in מַתְחִיל and יַתְחִיל, back again in לְהַתְחִיל. Its other signature is a long i in the stem — and its reputation as 'the causative' will mislead you within a week.
- When to Add ו and י: The Academy's RulesB1 — The whole of Hebrew's plene spelling comes down to one line: only i, o and u get a letter, and a and e get nothing. Here is that rule in operating form — where the ו goes, where the י goes, and the exceptions you will actually meet in print.