Which word to use for when, after, until and the rest is a vocabulary question, answered on temporal conjunctions and, for כש־ itself, on כש־ and כאשר. This page is the part that actually goes wrong: which tense the verb inside the clause takes.
The instruction is one line
Put the verb in the tense the event actually has. That is all of it. If the finishing is in the future, the verb is in the future — even though English will not let you say it that way.
אחרי שאסיים את המשמרת, אקפוץ אליכם.
akharéi she'asayém et hamishméret, ekpóts alekhém
After I finish my shift I'll pop over to yours. (both verbs future — English's 'after I finish' is an English rule, not a tense)
לפני שתצאי, תבדקי שסגרת את הגז.
lifnéi shetets'í, tivdekí shesagárt et hagáz
Before you go out, check you've turned the gas off. (to a woman)
אחרי שהיא סיימה את הלימודים היא עברה לברלין.
akharéi shehí siymá et halimudím hi avrá leberlín
After she finished her degree she moved to Berlin. (past event, past verb — the same instruction, different answer)
בזמן שאתה מחכה, תמלא את הטופס הזה.
bizmán she'atá mekhaké, temalé et hatófes hazé
While you're waiting, fill in this form. (to a man — the waiting is happening now, so the clause is present)
No authority states this as a codified rule, and it does not need one: the four examples above are simply what native speakers say, and between them they cover the whole system. What has to be unlearned is on the English side — after I finish, before you go, until he arrives all look present and all refer to the future, because English bans its own future in these clauses. Hebrew has no such ban, and the same constraint is switched off in real conditionals too.
The connectives, past and future
| Connective | Past reference | Future reference |
|---|---|---|
| כש־ / כאשר | כשהגענו kshehigánu | כשנגיע kshenagía |
| אחרי ש־ | אחרי שסיימנו akharéi shesiyámnu | אחרי שנסיים akharéi shenesayém |
| לפני ש־ | לפני שיצאנו lifnéi sheyatsánu | לפני שנצא lifnéi shenetsé |
| עד ש־ | עד שהגיע ad shehigía | עד שיגיע ad sheyagía |
| מאז ש־ | מאז שעברו me'áz she'avrú | — (מאז looks backwards by definition) |
| בזמן ש־ | בזמן שחיכינו bizmán shekhikínu | בזמן שנחכה bizmán shenekhaké |
מאז שהם עברו לצפון כמעט לא רואים אותם.
me'áz shehém avrú latsafón kim'át lo ro'ím otám
Since they moved north we hardly ever see them.
Every one of these carries a ש in front of a clause — fused into כש־ itself, written separately for the rest. Their bare forms are prepositions, and a preposition takes a noun, never a clause and never an infinitive.
| Before a clause | Before a noun |
|---|---|
| לפני ש־ + verb | לפני השיעור, לפני הארוחה |
| אחרי ש־ + verb | אחרי הסרט, אחרי החג |
| בזמן ש־ + verb | בזמן הנסיעה, בזמן ההופעה |
| מאז ש־ + verb | מאז המלחמה |
| עד ש־ + verb | עד יום חמישי, עד ההודעה הבאה |
An infinitive cannot follow לפני or אחרי, and the corpus is emphatic about it: insource:/ לפני שיצא / returns 321 and insource:/ לפני היציאה / returns 210, while insource:/ לפני לצאת / returns 1 (regex form, he.wikipedia, 17 August 2026). The English before leaving has no direct Hebrew equivalent — it becomes either a clause or a noun. This is worked through on the pa'al infinitive.
עד ש: what can honestly be said
Both חיכיתי עד שיגיע and חיכיתי עד שהגיע occur, and they are not rare variants of each other. Reading the first fifteen hits of insource:/ המתין עד ש/ (22 in all) and all eleven of insource:/ חיכו עד ש/ — 25 distinct sentences once one repeated snippet is dropped — 15 took a past verb and 10 took a future, all of them inside past narrative.
חיכינו עד שהגשם פסק ורק אז יצאנו.
khikínu ad shehagéshem pasák verák az yatsánu
We waited till the rain stopped and only then went out.
חיכינו עד שיגיע התור שלנו, ובינתיים שתינו קפה.
khikínu ad sheyagía hatór shelánu, uveintáyim shatínu kafé
We waited for our turn to come round, and drank coffee in the meantime. (a future verb inside a past narrative — and this is as ordinary as the sentence above it)
This guide could not find a source describing the difference between them, and an invented explanation would be worse than none — so there is no rule printed here. What the sample supports is the weaker and true statement: after עד ש־ in past narrative, both tenses are ordinary, and neither is a correction of the other. For future reference the question does not arise, since only the future is available: נחכה עד שהיא תסיים.
What a fluent speaker often reaches for instead
The clause is not always the natural choice. Hebrew makes verbal nouns freely, and a noun phrase after the bare preposition is shorter and very common.
לפני השיעור תעברו על החומר מהשבוע שעבר.
lifnéi hashi'úr ta'avrú al hakhómer mehashavúa she'avár
Before the lesson, go over last week's material. (to a group)
אחרי הסרט הלכנו לאכול משהו.
akharéi haséret halákhnu le'ekhól máshehu
After the film we went to get something to eat.
The nouns that do this work — נסיעה, הופעה, יציאה, ארוחה — are on verbal nouns, and the two prepositions themselves on לפני and אחרי.
Five worked items
| English | Hebrew | Why that tense |
|---|---|---|
| Call me when you land. | תתקשר אליי כשתנחת | The landing is in the future, so תנחת. English's when you land is present only because English forbids the alternative. |
| I'll wait until you're ready. | אחכה עד שתהיי מוכנה | Future reference after עד ש־, where only the future is available. |
| When I was little we lived in Haifa. | כשהייתי קטן גרנו בחיפה | Past event, past verb. The rule is about the event, not about the conjunction. |
| Whenever it rains the road floods. | כשיורד גשם הכביש מוצף | A standing generalisation, so present in both halves — a future here would make it one specific storm. |
| He left before I got there. | הוא עזב לפני שהגעתי | Both events are already over. Putting a future here because "temporal clauses take the future" is the classic over-correction. |
Common Mistakes
1. Dropping the ש before a clause. English after he arrived has one word doing the job, and the ש gets lost in translation. Without it you have a preposition with a sentence stuck to it.
❌ אחרי הוא הגיע התחלנו את הישיבה
Incorrect — a clause needs ש: אחרי שהוא הגיע התחלנו את הישיבה. Bare אחרי takes a noun instead: אחרי הגעתו.
✅ אחרי שהוא הגיע התחלנו את הישיבה בלי להתעכב.
akharéi shehú higía hitkhálnu et hayeshivá bli lehit'akév
After he arrived we started the meeting without further delay.
2. A present tense for one specific future event. The direct English calque. The Hebrew is well-formed; it has simply turned your plan into a habit.
❌ אחרי שאני מסיים את הפרויקט, אני לוקח שבוע חופש
after I finish the project I'll take a week off
Incorrect as a plan — the present in both halves reads as a routine, 'whenever I finish a project I take a week off'. For this project: אחרי שאסיים את הפרויקט, אקח שבוע חופש.
✅ אחרי שאסיים את הפרויקט, אקח שבוע חופש ואיעלם.
akharéi she'asayém et haproyékt, ekákh shavúa khófesh ve'e'além
Once I've finished the project I'm taking a week off and disappearing.
3. Over-correcting into the future when the event is over. The commonest side effect of learning rule one. The tense follows the event, and a past event keeps its past verb however the sentence is built.
❌ הוא עזב לפני שאני אגיע
he left before I got there
Incorrect as a report of what happened — a future verb here says 'before I will arrive'. The arrival is over: הוא עזב לפני שהגעתי.
✅ הוא עזב לפני שהגעתי, אז לא הספקנו לדבר בכלל.
hu azáv lifnéi shehigáti, az lo hispáknu ledabér bikhlál
He left before I got there, so we never got to talk at all.
4. Over-correcting into the future in a habit. The same mistake with the other kind of clause: a future verb picks out one occasion, which then collides with the תמיד sitting next to it.
❌ כשהיא תבוא אלינו היא תמיד מביאה עוגה
whenever she comes over she always brings a cake
Incorrect as a habit — a future verb makes it one specific visit, which תמיד then contradicts. A habit takes the present: כשהיא באה אלינו היא תמיד מביאה עוגה.
✅ כשהיא באה אלינו היא תמיד מביאה עוגה מהמאפייה ליד הבית.
kshehí ba'á elénu hi tamíd mevi'á ugá mehama'afiyá leyád habáyit
Whenever she comes over she always brings a cake from the bakery near us.
Key Takeaways
- One instruction covers the whole page: give the verb the tense its own event has, not the tense English's subordinate-clause rule imposes.
- So a future event takes a future verb inside the clause — אחרי שאסיים את המשמרת, אקפוץ אליכם; לפני שתצאי, תבדקי — which is exactly where English forbids its own future.
- A past event keeps the past (אחרי שהיא סיימה את הלימודים) and a habit keeps the present (כשיורד גשם הכביש מוצף). Over-correcting into the future is the standard side effect of learning the rule.
- All of them carry a ש before a clause: כש־ (fused into the word), אחרי ש־, לפני ש־, עד ש־, מאז ש־, בזמן ש־. The bare prepositions take a noun — לפני השיעור, אחרי הסרט — and never an infinitive.
- After עד ש־ in past narrative both tenses are attested and ordinary (15 past against 10 future in a 25-hit sample), and no source consulted describes the difference, so this page does not invent one.
- A לא after עד ש־ may add nothing — לא אצא עד שלא ייפסק הגשם means until it stops.
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Start learning Hebrew →Related Topics
- לפני ש־, אחרי ש־, עד ש־, מאז ש־A2 — Hebrew builds its time connectives by bolting ש onto a preposition: לפני הארוחה takes a noun, לפני שאכלנו takes a whole clause, and the ש is the only thing that tells them apart. This page covers the six of them — לפני ש, אחרי ש, עד ש, מאז ש, ברגע ש and כל פעם ש — plus the written בטרם and לאחר ש, and the exclamative עד שהגעת!
- כש־ and כאשר: WhenA2 — כש־ is the everyday when — an attached prefix taking a whole clause, as in כשהגעתי הביתה גיליתי שאין חשמל — and כאשר is its formal twin with identical syntax. The rule that decides whether your sentence works is the tense: for a future event Hebrew puts a future verb inside the clause, כשנחזור מהחופשה נתחיל לחפש דירה, exactly where English forces a present.
- Tense Inside a Subordinate ClauseB2 — Keep the speaker’s tense in reported complements, but use the future in future temporal clauses—even where English backshifts one and puts a present in the other.
- לפני and אחרי: Before and AfterA2 — Use לפני and אחרי for time, space and sequence, with personal suffixes and the crucial noun-versus-clause distinction.