Hebrew expresses modality through two different sentence designs. In one, the person who acts is the grammatical subject and the modal agrees with that person: אני צריך, היא צריכה. In the other, the modal frame stays in its default masculine-singular shape and the affected person, when named, appears with ל־: כדאי לי, מותר לה. Choosing the right design prevents a whole family of agreement errors.
אני צריך לנוח אחרי הנסיעה.
aní tsaríkh lanúakh akharéi hanesi'á
I need to rest after the journey. (m. speaker; inflecting modal)
כדאי לי לנוח אחרי הנסיעה.
kedái li lanúakh akharéi hanesi'á
It would be advisable for me to rest after the journey. (impersonal frame)
The propositions are nearly the same, but their grammar is not. In the first sentence אני controls masculine-singular צריך. In the second, כדאי remains כדאי and לי identifies the person for whom the advice is relevant.
The two construction types
The following table gives a practical first classification. Each model is a complete Hebrew sentence, so learn the modal together with the frame around it rather than as an isolated translation.
| Class A: subject + agreeing modal | Class B: frozen impersonal frame |
|---|---|
| צָרִיךְ — אֲנִי צָרִיךְ לָצֵאת. aní tsaríkh latsét — I need to leave. (m.) | אֶפְשָׁר — אֶפְשָׁר לְהִיכָּנֵס. efshár lehikanés — One can come in. |
| יָכוֹל — הִיא יְכוֹלָה לְהִצְטָרֵף. hi yekholá lehitstaréf — She can join. | אִי אֶפְשָׁר — אִי אֶפְשָׁר לָדַעַת. i efshár ladá'at — It is impossible to know. |
| חַיָּיב — אֲנַחְנוּ חַיָּיבִים לַעֲנוֹת. anákhnu khayavím la'anót — We have to answer. | מוּתָּר — מוּתָּר לָנוּ לַחֲנוֹת. mutár lánu lakhanót — We are allowed to park. |
| מוּכְרָח — הֵן מוּכְרָחוֹת לַעֲבוֹר דִּירָה. hen mukhrakhót la'avór dirá — They have no choice but to move. | אָסוּר — אָסוּר לְעַשֵּׁן. asúr le'ashén — Smoking is forbidden. |
| מְסוּגָּל — אַתְּ מְסוּגֶּלֶת לְסַיֵּים. at mesugélet lesayém — You are capable of finishing. | כְּדַאי — כְּדַאי לְךָ לְחַכּוֹת. kedái lekhá lekhakót — You should wait. (to a man) |
| עָלוּל — הַנֶּהָג עָלוּל לְאַחֵר. hanahág alúl le'akhér — The driver may be late. | חֲבָל — חֲבָל לְוַתֵּר. khavál levatér — It would be a pity to give up. |
| עָשׂוּי — הַפְּגִישָׁה עֲשׂוּיָה לְהִתְבַּטֵּל. hapgishá asuyá lehitbatél — The meeting may be canceled. | כֵּיף — כֵּיף לִי כָּאן. kef li kan — I am having fun here. |
| — | נָעִים — נָעִים לָנוּ בַּחוּץ. na'ím lánu bakhúts — It is pleasant for us outside. |
| — | קָשֶׁה — קָשֶׁה לָהּ לְהִתְרַכֵּז. kashé la lehitrakéz — It is hard for her to concentrate. |
| — | קַל — קַל לִי לִזְכּוֹר. kal li lizkór — It is easy for me to remember. |
Class A: a subject controls agreement
צריך, יכול, חייב, מוכרח, מסוגל, עלול, and עשוי can all head the agreeing construction. Gender and number belong on the modal; the following infinitive does not change. This is unlike English, where can, must, and may remain fixed whatever the subject.
המהנדס עשוי לבקש בדיקה נוספת לפני האישור.
hamehandés asúi levakésh bediká noséfet lifnéi ha'ishúr
The engineer may request another inspection before approval.
המערכת עלולה למחוק שינויים שלא נשמרו.
hama'arékhet alulá limkhók shinuyím sheló nishmerú
The system may delete unsaved changes.
אתן מסוגלות לפתור את זה בלי עזרה חיצונית.
atén mesugalót liftór et ze bli ezrá khitsonít
You are capable of solving this without outside help. (to a group of women)
עלול and עשוי frequently express possibility in formal news or administrative writing, though both also occur in ordinary careful speech. עלול tends toward an undesirable outcome; עשוי is neutral enough to introduce either a favorable or unfavorable one. That semantic tendency does not alter their agreement.
Class B: a default impersonal frame
אפשר, אי אפשר, מותר, אסור, כדאי, חבל, כיף, נעים, קשה, and קל build clauses without a nominative experiencer as their agreeing subject. The predicate appears in a default masculine-singular shape, the contemplated action follows as an infinitive or clause, and the relevant person may appear as לי, לך, לו, לה, לנו, לכם/לכן, or להם/להן.
אסור לנו לפרסם את השמות לפני שהמשפחות מקבלות הודעה.
asúr lánu lefarsém et hashemót lifnéi shehamishpakhót mekablót hoda'á
We are not allowed to publish the names before the families are notified.
קל לה לדבר מול קהל כשהיא מכירה את הנושא.
kal la ledabér mul kahál kshehí makirá et hanosé
It is easy for her to speak before an audience when she knows the subject.
חבל לנו שהמסעדה נסגרת אחרי כל כך הרבה שנים.
khavál lánu shehamis'adá nisgéret akharéi kol kakh harbé shaním
We are sorry that the restaurant is closing after so many years.
The dative is not always obligatory. אפשר להיכנס makes a general statement, whereas אפשר לנו להיכנס identifies “us” as the people with the opportunity or permission. Hebrew thus often expresses what English packages as a personal clause—“we are allowed,” “she finds it difficult”—through an impersonal evaluation plus a dative experiencer.
“Frozen” describes the frame, not every dictionary entry
This distinction is construction-specific. אפשר and adverbial כדאי are genuinely invariant in these uses. Other items have ordinary agreeing uses elsewhere: העבודה קשה “the work is difficult,” המים קרים “the water is cold,” and האווירה נעימה “the atmosphere is pleasant.” כיף is historically and synchronically noun-like, even though כיף לי functions as a predicate. מותר and אסור can likewise occur as agreeing participles outside the permission/prohibition frame.
השאלות קשות, אבל לי דווקא קל להתרכז במבחנים.
hashe'elót kashót, avál li dávka kal lehitrakéz bemivkhaním
The questions are difficult, but I actually find it easy to concentrate during exams.
The sentence displays both grammars: קשות agrees with plural שאלות, while impersonal קל stays masculine singular and לי marks the experiencer.
Nor does each lexical item live in only one class. צריך can appear personally—אני צריך ללכת “I need to go”—or impersonally—צריך ללכת “one needs to go.” יכול normally agrees, but יכול להיות ש־ “it may be that” is a fixed impersonal possibility frame.
צריך להגיש את הטופס עד סוף החודש.
tsaríkh lehagísh et hatófes ad sof hakhódesh
The form needs to be submitted by the end of the month. (impersonal צריך)
יכול להיות שנצטרך לדחות את ההחלטה.
yakhól lihyót shenitstarékh lidkhót et hahakhlatá
We may have to postpone the decision. (impersonal יכול להיות)
Time reference in one glance
In the present, Hebrew usually uses these forms without a copula. For past or future reference, agreeing predicates commonly combine with the appropriate form of היה, while impersonal frames generally use default היה or יהיה: הייתי צריך, היא הייתה מוכרחה, היה אפשר, יהיה כדאי. יכול and צריך also have their own finite forms, such as יכולתי and אצטרך. The complete system belongs on modals in the past and future.
Common Mistakes
1. Giving an impersonal modal a bare personal subject. Replace the subject with a ל־phrase, or choose an agreeing modal.
❌ אנחנו מותר להיכנס מאחור
Incorrect—in the permission frame, מותר stays fixed and ‘we’ becomes לנו.
✅ מותר לנו להיכנס מאחור כשהכניסה הראשית סגורה.
mutár lánu lehikanés me'akhór kshehaknisá harashít sgurá
We are allowed to enter from the back when the main entrance is closed.
2. Leaving an inflecting modal in masculine singular. The modal, not the infinitive, carries agreement.
❌ הסוללות עלול להיגמר באמצע היום
Incorrect—the feminine-plural subject הסוללות requires עלולות.
✅ הסוללות עלולות להיגמר באמצע היום אם לא נטען אותן עכשיו.
hasolelót alulót lehigamér be'émtsa hayóm im lo nit'án otán akhsháv
The batteries may run out in the middle of the day if we don't charge them now.
3. Extending the frozen frame into an ordinary adjective sentence. קַל is default only in the impersonal construction; it agrees when it describes a plural noun.
❌ התרגילים קל, אז סיימנו מהר
Incorrect—here קל directly describes plural התרגילים and must agree: קלים.
✅ התרגילים קלים, אז סיימנו מהר.
hatargilím kalím, az siyámnu mahér
The exercises are easy, so we finished quickly.
4. Trying to make אפשר agree. Use אפשר + dative, or replace it with יכול when a personal subject is central.
❌ היא אפשר לבוא קצת יותר מאוחר
Incorrect—אפשר does not agree with היא in this construction.
✅ אפשר לה לבוא קצת יותר מאוחר, והיא יכולה להישאר עד הסוף.
efshár la lavó ktsat yotér me'ukhár, vehi yekholá lehisha'ér ad hasóf
She may come a little later, and she can stay until the end.
Key Takeaways
- Inflecting modals take a subject and agree: היא צריכה, הם יכולים, הן מוכרחות.
- Impersonal frames stay in a default shape and mark the affected person with ל־: מותר לה, כדאי לנו, קשה לי.
- “Frozen” belongs to a construction. קשה, קל, נעים, מותר, and אסור can agree in other sentence types.
- Some words participate in both designs: personal אני צריך versus impersonal צריך, and personal יכול versus impersonal יכול להיות ש־.
- Present structure predicts the tense pattern: agreeing היה with Class A, default היה/יהיה with Class B, subject to lexical irregularities.
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- צריך: Need and MustA1 — One word covers English's need, have to and should — and it is not a verb. צריך is an adjective, so it agrees with its subject (צריך, צריכה, צריכים, צריכות) and has no tense of its own. It takes either an infinitive or a plain noun, and it can also stand with no subject at all.
- יכול: Can, May, MightA2 — Use the agreeing verb יכול for ability, permission, and possibility, and choose its irregular past and future forms accurately.
- חייב and מוכרח: Hard ObligationB1 — Use the agreeing predicates חייב and מוכרח for strong obligation, distinguish modal חייב + infinitive from debt חייב + a dative creditor + a noun, and never confuse לא חייב with prohibition.
- Impersonal Predicates: כיף, נעים, חבל, קשה, כדאיB1 — Build Hebrew experiencer sentences with a default masculine-singular predicate and a ל־marked person, while recognizing where the same words agree outside this frame.
- Modals in the Past and Future: היה צריך, יהיה אפשרB1 — Place Hebrew modal meanings in past and future time with agreeing forms such as הייתי צריך and impersonal frames such as היה אפשר.