The Dictionary Form Is the Past-Tense הוא

An English dictionary names a verb by its infinitive: write, go, take. Hebrew names it by a fully inflected form — כָּתַב katáv, the third-person masculine singular past, which as a sentence means "he wrote". Every table in this guide's Verb Reference is headed that way, and so is every traditional Hebrew dictionary entry.

This is not a quirk of lexicography. It follows from how a Hebrew word is built.

Why the past, of all things

In the pa'al binyan the 3ms past is the only form in the whole paradigm that is nothing but the three root letters — no prefix, no suffix, and no vowel letter padding it out. Compare:

Pour any pa'al root into the 3ms past and the three radicals sit on the surface in order, separated only by vowels the page does not print. That is the cleanest possible headword for a language whose lookups are root-based.

Be honest about the limit of that argument, though: it holds fully only for pa'al. Everywhere else something extra rides along — the binyan's own prefix in נִכְנַס, הִסְבִּיר, הִתְלַבֵּשׁ, and in pi'el and pu'al a vowel letter that ktiv male inserts, so three-letter ד־ב־ר and ס־פ־ר surface as four-letter דיבר and סופר. The root is not quite bare. That turns out to be a feature rather than a defect: the headword tells you the binyan at a glance, which the infinitive also does but the present tense does not.

Three conventions, all current

One verb, three different places to look for it — and none of the three is a mistake.

So one verb lands in three places: a root-organised dictionary files כתב under כ־ת־ב, an alphabetical one files it under כ, and the site you actually have open heads the page with לכתוב. An Israeli asked how to say something will hand you the infinitive too, because that is how the question is phrased in Hebrew. Check which convention a reference uses before you decide it is missing a word. This guide follows the traditional one: 3ms past as the headword, with the infinitive given as a principal part.

The trap: the citation form is a live word

כתב is not an abstract naming label like English to write. It is a real inflected form doing a real job in real sentences, and that job is he wrote — masculine, singular, third person, past. A dictionary headword in Hebrew is a sentence waiting to happen.

Two consequences follow immediately. You cannot drop כתב into a slot that calls for an infinitive, and you cannot use it about a woman, a plural or yourself without re-inflecting it.

Stripping a form back to the citation form

Here is the procedure, in order. Run it on any verb you meet in running text.

1. Infinitive? Remove the ל.
2. Future? Remove the prefix — א (I), ת (you / she), י (he / they), נ (we) — and any ending (־י, ־ו).
3. Present, and neither pa'al nor nif'al? Remove the מ, then the gender-number ending (־ת, ־ים, ־ות). Pa'al and nif'al build their present out of the root itself and have no מ to strip.
4. Past? Remove the person ending (־תי, ־ת, ־נו, ־תם, ־ה, ־ו).
5. Restore whatever radical assimilated or elided — the נ of a פ״נ verb, the י of a פ״י verb, the ה of a ל״ה verb, the נ that the nif'al hides in the future.

Step 5 is the one that separates a successful lookup from a failed one. The first four steps subtract; only the fifth requires you to know something — which is why it is drilled separately on identifying a verb's גזרה.

The verbs that do not run backwards

Now the habit this page exists to break. Learners memorise verbs as infinitives, because that is how English stores them and how an Israeli says them out loud — and for regular verbs it costs nothing, since לִכְתּוֹב and כָּתַב are transparently the same word.

For the verbs you need most, it costs everything. Their infinitives are built on a stem the citation form does not contain, and no rule runs the derivation backwards.

Look at לָתֵת. Two of its three radicals are absent from it, and the verb it belongs to is נָתַן. There is no procedure that produces one from the other; you learn the pair, or you cannot look the verb up. What to do once you have the citation form — and which references will accept the inflected form directly — is on looking a word up.

Common Mistakes

1. Using the citation form as if it were an infinitive. It is a finite past-tense verb, so it cannot follow רוצה, צריך or כדי.

2. Recovering the citation form from an irregular infinitive by subtraction. Subtraction alone gets you a real word that is the wrong word.

3. Leaving the headword uninflected. A Hebrew headword is masculine, singular and third person, and stays that way only if the subject is.

4. Building an infinitive out of the citation form by rule. For weak roots the infinitive has to be looked up too.

Key Takeaways

• Hebrew's dictionary form is the third-person masculine singular past — כָּתַב, דִּיבֵּר, נִכְנַס, הִסְבִּיר — not the infinitive.
• The reason is structural: in pa'al that form is the three root letters and nothing else — no prefix, no suffix, no vowel letter. Elsewhere it keeps the binyan's prefix, which identifies the binyan for free.
• Three arrangements are all current. Even-Shoshan heads the entry with the past 3ms and files it under the root; Milog heads it with the past 3ms alphabetically; Pealim heads its verb pages with the infinitive — its נ־פ־ל page is לִיפּוֹל — and so does any Israeli you ask. Check which one you are reading.
• The headword is a live inflected form: כתב in a sentence means he wrote, never to write, and it must be re-inflected for any other subject.
• The stripping procedure is subtract, then restore: remove ל / the future prefix / the present מ / the person ending, then put back the radical that assimilated or elided.
• Learn every verb as a pair — citation form and infinitive. לָדַעַת ← יָדַע, לָקַחַת ← לָקַח, לָתֵת ← נָתַן: none of these runs backwards by rule.