Lesson 26: Weak roots (שורשים חלשים) — where the root "misbehaves"

Part 1: What is a "weak root"

Recall L6: Hebrew stores its lexicon not as a list, but as families around a three-letter root. All verb forms, verbal nouns, and adjectives are built as "root + pattern". In L8–L25 we worked with regular roots — where all three consonants stayed in place in every form.

A weak root is a root in which one of the three letters is "capricious" and in certain forms drops, vanishes, or changes into a vowel. There are five capricious letters:

Letter	Name	What's "weak" about it
נ	nun	drops if it's first and closes a syllable
י	yod	at the start of the root it turns into "y-" → a vowel in the future
ה	hey	at the end of the root it almost always disappears
א	alef	at the end of the root it's silent and merges with the vowel
ע ח	ayin, het	gutturals — they hate sheva and pull "a" toward themselves

Metaphor: a regular root is three solid pillars. A weak root has three pillars, one of which is springy: sometimes it's in place, sometimes it collapses, sometimes it changes shape. A native speaker doesn't think about it — they just recognize the whole word. We need to know the classes so we don't get lost.

Analogy with English

In English we don't keep the root the same across all forms of a verb either:

Root "idea"	Forms	What happened
sing-	sing, sang, sung, singing	vowel changes
go-	go, went, gone	whole word replaced in past
run-	run, ran, running	vowel changes
bring-	bring, brought	irregular past

We don't consider these "mistakes" or "exceptions" — they're classes of alternation that a native speaker knows by heart. The same is true in Hebrew, except there it isn't the vowel that "misbehaves" but one of the three consonants of the root. And there are only five classes.

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Part 2: Where to look — position of the weak letter in the root

A weak letter can stand in any of the three positions of the root. The class names come from the old mnemonic root פ-ע-ל (pa'al, "to do"), where פ = the first position, ע = the second, ל = the third.

Position	Name	Meaning
פ (first)	pe-something	the first letter of the root is weak
ע (second)	ayin-something	the middle letter of the root is weak
ל (third)	lamed-something	the last letter of the root is weak

We combine the position and the weak letter and get the class name:

• pe-nun (פ"נ): first letter of the root is נ (e.g., נ-פ-ל "to fall", נ-ת-ן "to give")
• pe-yod (פ"י): first letter is י (e.g., י-ש-ב "to sit", י-ר-ד "to descend")
• ayin-vav / ayin-yod (ע"ו / ע"י): middle letter is ו or י (e.g., ק-ו-ם "to get up", ש-י-ר "to sing")
• lamed-hey (ל"ה): last letter is ה (e.g., ר-א-ה "to see", ק-נ-ה "to buy")
• lamed-alef (ל"א): last letter is א (e.g., ק-ר-א "to read", מ-צ-א "to find")
• pe-gronit (פ"גרונית) / ayin-gronit: one of the positions is a guttural (ע, ח, ה, א, ר) — it pulls "a" toward itself

In this lesson we'll cover the four main classes (pe-nun, pe-yod, ayin-vav, lamed-hey) and meet the gutturals along the way. Full coverage of every subtlety belongs to C1; for B2 these four classes cover 90% of high-frequency verbs.

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Part 3: Class pe-nun (פ"נ) — nun drops in the future

The rule in one line: if the first letter of the root is נ, in the future tense in binyan Pa'al it drops, compensated by a dagesh (or, in unpointed writing, by nothing — just an absent letter).

Model: root נ-פ-ל (nafal, "to fall")

A regular verb (e.g., כ-ת-ב, katav) in the future 3rd m.sg. is yikhtov (he will write). Applying the same pattern to נ-פ-ל would give *yinpol. But the nun drops, and we get:

Form	Regular (katav)	Pe-nun (nafal)
Past, 3 m.sg.	katav (כתב)	nafal (נפל)
Present, m.sg.	kotev (כותב)	nofel (נופל)
Future, 3 m.sg.	yikhtov (יכתוב)	yipol (יפול) — no nun!
Infinitive	likhtov (לכתוב)	lipol (ליפול) — no לנפול

Key trap: in the past and present the nun is in place (nafal, nofel). But in the future and the infinitive it disappears. Don't look for logic — it's a historical contraction you simply need to recognize.

The most frequent pe-nun: root נ-ת-ן (latet, "to give")

This root is doubly weak: both פ"נ (first nun) and ל"נ (last nun). So it's the most deformed of all.

Form	Hebrew	Translit	English
Infinitive	לתת	latet	to give
Past, 3 m.sg.	נתן	natan	he gave
Past, 1 sg.	נתתי	natati	I gave
Present, m.sg.	נותן	noten	gives (m.)
Present, f.sg.	נותנת	notenet	gives (f.)
Future, 3 m.sg.	יתן	yiten	he will give
Future, 1 sg.	אתן	eten	I will give
Imperative, m.	תן	ten!	give!

Look: in ten! ("give!") and in eten (I will give) both nuns dropped — only one "t" is left. This short ten is one of the first words you hear from Israeli children. And it has "eaten" two of the three letters of the root.

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Part 4: Class pe-yod (פ"י) — yod turns into a vowel

The rule in one line: if the first letter of the root is י, in the future and in the infinitive it "dissolves" into a vowel "e-" (or "o-"). Only the last two consonants of the root remain.

Model: root י-ש-ב (yashav, "to sit")

Form	Hebrew	Translit	English
Past, 3 m.sg.	ישב	yashav	he sat
Past, 1 sg.	ישבתי	yashavti	I sat
Present, m.sg.	יושב	yoshev	sits (m.)
Present, f.sg.	יושבת	yoshevet	sits (f.)
Infinitive	לשבת	lashevet	to sit (no initial י!)
Future, 3 m.sg.	ישב	yeshev	he will sit
Future, 1 sg.	אשב	eshev	I will sit

Compare with the regular verb's infinitive: likhtov (לכתוב, "to write"). The pe-yod infinitive is lashevet, with the ending -et, like the present f.sg. This is the special infinitive pattern of pe-yod. Don't confuse it with the regular li-K-T-oV.

Other frequent pe-yod

Root	Infinitive	Future 3 m.sg.	English
י-ר-ד	laredet	yered	to descend, to get off (transport)
י-צ-א	latset	yetse	to go out (from a place)
י-ד-ע	lada'at	yeda	to know
י-ל-ד	laledet	teled (she will give birth)	to give birth

Notice: all these infinitives end in -et — this is the pe-yod marker in Pa'al. When you see lada'at, laredet, latset — know: it's pe-yod, and in the future the yod will disappear.

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Part 5: Class ayin-vav / ayin-yod (ע"ו) — the middle letter is invisible

The rule in one line: if the middle letter of the root is ו or י, it behaves not as a consonant but as a long vowel. The verb seems to have only two visible consonants, with "a", "o", "u", or "i" stretched between them.

These verbs are called "hollow" (פעלים גזורים, "hollow") — the root seems empty in the middle.

Model: root ק-ו-ם (kam, "to get up")

Form	Hebrew	Translit	English
Past, 3 m.sg.	קם	kam	he got up
Past, 3 f.sg.	קמה	kama	she got up
Past, 1 sg.	קמתי	kamti	I got up
Present, m.sg.	קם	kam	gets up
Present, f.sg.	קמה	kama	gets up
Infinitive	לקום	lakum	to get up
Future, 3 m.sg.	יקום	yakum	he will get up
Future, 1 sg.	אקום	akum	I will get up
Imperative, m.	קום	kum!	get up!

Main trap: present and past 3 m.sg. look identical: kam = "he gets up" AND "he got up". Distinguish by context and by other forms.

Other frequent "hollow" verbs

Root	Infinitive	Past 3 m.sg.	Future 3 m.sg.	English
ב-ו-א	lavo	ba	yavo	to come
ש-י-ר	lashir	shar	yashir	to sing
ר-ו-ץ	larutz	ratz	yarutz	to run
ש-י-ם	lasim	sam	yasim	to put, to place
ג-ו-ר	lagur	gar	yagur	to live, to reside

All these verbs look two-lettered in the past: ba, shar, ratz, sam, gar. Don't panic: the middle ו or י is "hidden" in the long vowel.

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Part 6: Class lamed-hey (ל"ה) — final hey dissolves

The rule in one line: if the last letter of the root is ה, it disappears in most forms, and instead an ending "-a", "-e" or "-i" appears at the end of the word.

This is how hundreds of high-frequency verbs work: "see", "do", "buy", "build", "drink", "answer"…

Model: root ר-א-ה (ra'a, "to see")

(Technically this is both lamed-hey and pe-gronit because of the alef — but it's classified as ל"ה.)

Form	Hebrew	Translit	English
Past, 3 m.sg.	ראה	ra'a	he saw
Past, 3 f.sg.	ראתה	ra'ata	she saw
Past, 1 sg.	ראיתי	ra'iti	I saw — no ה!
Present, m.sg.	רואה	ro'e	sees (m.)
Present, f.sg.	רואה	ro'a	sees (f.)
Present, m.pl.	רואים	ro'im	see (m.)
Infinitive	לראות	lir'ot	to see — ending -ot!
Future, 3 m.sg.	יראה	yir'e	he will see
Future, 1 sg.	אראה	er'e	I will see

Remember the three ל"ה markers:

1. The infinitive ends in -ot (lir'ot, lalekhet — stop, lalekhet is different; more precisely: lir'ot, livnot, liknot, lihiot, lashtot).
2. The future 3 m.sg. ends in -e (yir'e, yivne, yikne, yiheye, yishte).
3. The past 1 sg. ends in -iti with no ה at all (ra'iti, baniti, kaniti, hayiti, shatiti).

Other frequent lamed-hey

Root	Infinitive	Past 3 m.sg.	Future 3 m.sg.	English
ע-ש-ה	la'asot	asa	ya'ase	to do
ק-נ-ה	liknot	kana	yikne	to buy
ב-נ-ה	livnot	bana	yivne	to build
ש-ת-ה	lishtot	shata	yishte	to drink
ה-י-ה	lihiot	haya	yiheye	to be
ר-צ-ה	lirtsot	ratsa	yirtse	to want
ע-נ-ה	la'anot	ana	ya'ane	to answer

"To want" (lirtsot) is one of the most frequent verbs of all: "I want" = ani rotse (m.) / ani rotsa (f.). This is already lamed-hey — you've been bumping into it since L8, you just didn't know it was weak.

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Part 7: Class pe-hey (פ"ה) — the special case of "to go"

One verb stands apart: ה-ל-ך (halakh, "to go"). By all rules it should conjugate like pe-gronit (the first letter is the guttural ה). But historically it was uniquely deformed:

Form	Hebrew	Translit	English
Past, 3 m.sg.	הלך	halakh	he went
Past, 3 f.sg.	הלכה	halkha	she went
Past, 1 sg.	הלכתי	halakhti	I went
Present, m.sg.	הולך	holekh	goes (m.)
Present, f.sg.	הולכת	holekhet	goes (f.)
Infinitive	ללכת	lalekhet	to go — ה disappeared!
Future, 3 m.sg.	ילך	yelekh	he will go
Future, 1 sg.	אלך	eilekh	I will go
Imperative, m.	לך	lekh!	go!

Anomaly: in the infinitive lalekhet and in the future yelekh the letter ה disappeared, as if the root were ל-ל-ך, not ה-ל-ך. This is a unique verb, conjugated "as a pe-yod" although formally it's pe-hey. Just memorize lalekhet / eilekh / yelekh as a single block.

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Part 8: Special case — "to take" (lakachat)

The root ל-ק-ח (lakach, "to take") is formally regular (all three consonants are ordinary), but it behaves like pe-nun: the first letter ל "drops" in the future and the infinitive, as if it were a nun. This is a historical analogy.

Form	Hebrew	Translit	English
Past, 3 m.sg.	לקח	lakach	he took
Past, 1 sg.	לקחתי	lakachti	I took
Present, m.sg.	לוקח	lokeach	takes (m.)
Present, f.sg.	לוקחת	lokachat	takes (f.)
Infinitive	לקחת	lakachat	to take
Future, 3 m.sg.	יקח	yikach	he will take — ל dropped!
Future, 1 sg.	אקח	ekach	I will take
Imperative, m.	קח	kach!	take!

This is the only "regular-looking" root that behaves like a weak one. Memorize it as an exception: lakachat / yikach / kach!

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Part 9: Gutturals (ע, ח, ה, א, ר) — they pull "a" toward themselves

This isn't a separate class but a general tendency: guttural letters (ayin, het, hey, alef, resh) hate sheva (zero vowel) and pull "a" toward themselves. It's a small but pervasive deformation.

For example, the root ע-ב-ד (avad, "to work") in the future should give *ye'vod. But the ayin pulls "a" toward itself, giving ya'avod (יעבוד) — with an extra "a" before ע.

Compare:

• Regular (k-t-v): yikhtov (he will write)
• Pe-gronit (a-v-d): ya'avod (he will work)

The same with roots where the guttural is in the middle (e.g., ש-א-ל "to ask" → lish'ol, not *lishol) or at the end (ש-מ-ע "to hear" → lishmoa, not *lishmo).

Main point: gutturals don't drop like nun or yod. They only pull the vowel. It's a "soft" deviation, and in speech you quickly get used to it.

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Part 10: Map of the five key verbs

Memorize these five verbs as a mandatory minimum. They're in the top-30 most frequent verbs of modern Hebrew.

Root	Class	Infinitive	Past 3 m.sg.	Pres. m.sg.	Fut. 3 m.sg.	English
ל-ק-ח	(regular, but like pe-nun)	lakachat	lakach	lokeach	yikach	to take
ה-ל-ך	pe-hey (unique)	lalekhet	halakh	holekh	yelekh	to go
ר-א-ה	lamed-hey	lir'ot	ra'a	ro'e	yir'e	to see
נ-ת-ן	pe-nun (double)	latet	natan	noten	yiten	to give
ק-ו-ם	ayin-vav	lakum	kam	kam	yakum	to get up

Memorize by rhythm: "lakachat, lalekhet, lir'ot, latet, lakum" — repeat aloud 10 times. This is your first "weak verb pack". Later you'll attach the other weak roots to these as anchors.

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