לא: The Basic Negator

Almost every negative sentence in Hebrew is built with one word: לֹא lo. It has no forms, it needs no helper, and it goes straight in front of whatever it is denying. This page is about that word — where it stands, what it attaches to, and the things English speakers keep trying to add to it that Hebrew does not want. The separate negative word for there isn't and I haven't got is אין, and negative requests (אל תלך) are on אל plus the future.

One word, no forms

לא never changes. Not for gender, not for number, not for person, not for tense. Whatever you are negating, and whoever is doing it, the word is לא.

Read the last two rows next to each other and you have the whole of Hebrew negation in miniature. הוא לא רופא is a complete sentence with no verb in it, because there is no present-tense is in Hebrew to negate — the subject, the negator and the predicate are all it needs. That absence is set out on Hebrew has no 'am', 'is' or 'are', and it is the reason the negative looks so short.

לא attaches to the word right after it

This is the rule that repays attention. לא does not negate "the sentence"; it negates the element immediately following it, and moving it moves the meaning.

Same five words at the front, one moved, two different claims. In the first the ordering did not happen; in the second it certainly happened, just not by me. Nothing marks the difference except which word לא is standing in front of, so keep the two words glued together: negate the verb, and לא goes in front of the verb. What falls inside the negation in longer sentences is worked out on the scope of the negation.

לא is also a whole answer, and it takes reinforcements

On its own, לא is the word no. It is also the base for a small set of everyday intensifiers, all of them ordinary conversational Hebrew.

That last one is worth a moment. English builds a tag question by rebuilding the auxiliary and flipping its polarity — you're coming, aren't you, he went, didn't he. Hebrew has one tag for all of them, and it is just the word לא.

Negating an infinitive

לא goes in front of the infinitive, between it and the verb that governs it. No extra word appears.

Note that החלטנו לא לספר (we decided not to tell) and לא החלטנו לספר (we didn't decide to tell) are two different decisions. Again: לא negates what comes next.

A clause with אף אחד or כלום keeps its לא

English cancels its negatives — nobody came, with one negative word, not two. Hebrew agrees with itself instead: the negative pronoun and the negator both appear, and the sentence is negative once.

The same holds for שום דבר, אף פעם and אף אחד מהם. The system is set out in full on double negation.

Two register facts, not two errors

לא in front of a participle is normal Hebrew. You will be told that the "correct" negative of a present-tense verb is the inflected אֵינוֹ — הוא אינו מבין rather than הוא לא מבין. The Academy of the Hebrew Language's own discussion of the question holds that לא with a participle is entirely natural for present-day speakers. What language editors recommend is אינו in writing and in formal speech — a stylistic preference, not a correction. And when the predicate comes before the subject, לא is not merely tolerated but the Academy's own recommendation, which is where the ancient evidence sits: the Bible has כִּי לֹא שֹׂנֵא הוּא לוֹ (Deuteronomy 19:6) and the Jerusalem Talmud לא דומה המבייש את הגדול למבייש את הקטן (Ketubot 3:7, 27d). That order is alive in modern Hebrew too — לא ברור מה קרה, לא ידוע לי על כך, לא נראה לי.

לא plus a second-person future is a prohibition, not a mistake. The Academy describes the negative command as always built on future forms, citing לֹא תִּרְצַח beside אַל תִּשְׁלַח. The two are not interchangeable in tone: אל plus the future is the everyday request, לא plus the future is the categorical ban — a rule, a sign, a parent who has finished discussing it. What אל cannot do is negate a statement. It is not a general "not"; it exists only to tell somebody not to do something, and it needs a second-person future behind it. A sentence about yourself takes לא however forcefully you mean it — אני לא רוצה לדבר על זה, never *אני אל רוצה.

Common Mistakes

1. Dropping the לא because English has already said "nobody". The single most frequent negation error at A1, and it comes from counting negatives the English way.

2. Spelling לא as לו. Both are pronounced lo, and writing by ear produces the wrong one.

3. Expecting לא itself to carry past tense. I didn't see puts the past in the English auxiliary and leaves see bare. Hebrew has no do-support auxiliary: in an ordinary report of a finished event, the verb itself has to be past.

Do not overcorrect the native narrative present, though. Israelis tell stories in the present, and once the story starts the whole thing stays there, past adverb and all: אתמול אני מגיע למשרד, ואני לא רואה אותו בכלל — so yesterday I get to the office, and he's nowhere to be seen. That is ordinary informal Hebrew, just as it is in English. The contrast is discourse, not a ban on a string: use the past for a flat report of a finished event, and the present when you deliberately stage the event as a story happening now.

Key Takeaways

• לא is invariable. One form for every gender, number, person and tense. There is nothing to conjugate.
• It stands immediately in front of what it negates, and moving it changes the meaning: אני לא הזמנתי versus לא אני הזמנתי.
• No do-support anywhere. Didn't, doesn't and don't have no Hebrew counterpart; the tense stays inside the verb.
• לא is also the bare answer no, the base of ממש לא and בכלל לא, and the universal tag question: אתה בא, לא?
• It negates an infinitive directly: החלטנו לא לספר.
• A clause with אף אחד, כלום, שום דבר, אף פעם keeps its לא. The negatives agree; they do not cancel.
• הוא לא מבין is ordinary Hebrew, not a corruption of הוא אינו מבין — אינו is a preference for writing and formal speech. Put the predicate first and לא stops being merely tolerated: לא ברור מה קרה is what the Academy itself recommends.
• לא plus the future is a categorical prohibition (לא תיכנסו); אל plus the future is the everyday request (אל תיכנסו). אל never negates a statement — only a person.
• לא never stands in front of יש. Existence and possession are denied with אין.