Here is one of the cleanest, most predictable mistakes English speakers make in Russian — and one of the easiest to fix once you see it. In English, after when, if, as soon as, or while referring to the future, we slip into the present tense: "When I arrive, I'll call you." Russian does not allow this. If the event is in the future, the subordinate clause goes in the future too: Когда́ я прие́ду, я тебе́ позвоню́ — literally "When I will arrive, I'll call you." The rule is simply: both clauses future. Master that and a whole category of errors disappears.
The rule: both clauses future
English splits the two halves of a future sentence across two tenses. The main clause gets will + verb; the subordinate clause (the when / if part) drops back to the present. Russian keeps them parallel — both in the future.
| English | Subordinate | Main |
|---|---|---|
| When I arrive, I will call. | present | future |
| Когда́ я прие́ду, я позвоню́. | future | future |
Когда́ я прие́ду в Москву́, я тебе́ позвоню́.
When I arrive in Moscow, I'll call you. — прие́ду is future ('will arrive'), позвоню́ is future; both halves future.
Е́сли бу́дет вре́мя, мы погуля́ем по це́нтру.
If there's time, we'll take a walk downtown. — бу́дет ('there will be') is future, погуля́ем is future.
Как то́лько он придёт, начнём.
As soon as he arrives, we'll start. — придёт ('will arrive') future, начнём future.
In the English versions, "arrive", "is", "arrives" are all present — but they point at the future, and Russian makes that explicit. Whenever the whole situation lies ahead, every verb in it that refers to the future is in the future tense.
The four conjunctions that trigger it
The rule applies after the temporal and conditional conjunctions that introduce a future event. The four to drill:
| Conjunction | Meaning | English subordinate tense | Russian subordinate tense |
|---|---|---|---|
| когда́ | when | present | future |
| е́сли | if | present | future |
| как то́лько | as soon as | present | future |
| пока́ | while / as long as | present | future |
Е́сли уви́дишь Анто́на, переда́й ему́ приве́т.
If you see Anton, say hi to him. — уви́дишь ('will see') future, even though English says 'see'.
Когда́ зако́нчишь рабо́ту, напиши́ мне.
When you finish work, text me. — зако́нчишь future; the English 'finish' is present-for-future.
Как то́лько узна́ю результа́ты, сра́зу тебе́ скажу́.
As soon as I find out the results, I'll tell you right away. — узна́ю future, скажу́ future.
For the full inventory of temporal conjunctions and how they pin events in time, see temporal conjunctions; for the если/когда choice specifically, see conditional vs temporal.
Aspect inside the future clause
"Both clauses future" tells you the tense; you still choose the aspect normally. The choice is the usual one — perfective for a single completed event, imperfective for an ongoing or repeated one — and it interacts naturally with the conjunction.
- когда́ / как то́лько
- a single completed event → perfective future (simple future): прие́ду, придёт, узна́ю, зако́нчу.
- пока́ describing two simultaneous ongoing actions → imperfective future (compound future, бу́ду + infinitive): бу́ду гото́вить, бу́дешь рабо́тать.
Пока́ ты бу́дешь гото́вить у́жин, я накро́ю на стол.
While you're cooking dinner, I'll set the table. — пока́ + imperfective future бу́дешь гото́вить (ongoing); накро́ю perfective (one completed act).
Когда́ я прие́ду, мы всё реши́м.
When I arrive, we'll sort everything out. — прие́ду perfective (one arrival), реши́м perfective (settle it once).
Пока́ бу́дем е́хать, я тебе́ всё расскажу́.
While we're driving, I'll tell you everything. — бу́дем е́хать imperfective future (the whole journey), расскажу́ perfective.
The contrast in the пока́ examples is the point: пока́ frames a stretch of time during which something else happens, so the пока́-clause is naturally imperfective ("while X is going on"). The когда́/как то́лько events are typically pinpoint completions, so they're perfective. (For how to build each, see the perfective simple future and the imperfective compound future.)
Пока́ не + perfective future = "until"
A special case worth isolating: пока́ … не + perfective future means "until". The не here is not a real negation — it's part of the "until" construction — and the verb after it is perfective future.
Жди здесь, пока́ я не верну́сь.
Wait here until I get back. — пока́ … не верну́сь = 'until I return'; верну́сь is perfective future, not a true negative.
Не уходи́, пока́ мы не договори́мся.
Don't leave until we reach an agreement. — пока́ … не договори́мся ('until we come to terms').
Бу́дем рабо́тать, пока́ не зако́нчим.
We'll keep working until we finish. — пока́ не зако́нчим, the 'until done' frame, perfective future.
So пока́ has two faces in the future: bare пока́ + imperfective = "while" (two things going on at once), and пока́ … не + perfective = "until" (you do one thing right up to the point the other completes). Don't read the не as "not".
Source-language contrast: the present-for-future trap
This is, above all, a transfer error. English has a quiet rule that after temporal/conditional conjunctions we use the present even for future time — "When it stops raining, we'll go out", "If she calls, tell her…". Because this rule operates below conscious awareness for native English speakers, they carry it straight into Russian and produce a present where Russian demands a future.
The result, Когда́ я приезжа́ю в Москву́, я позвоню́, is not just slightly off — it changes the meaning. With the present imperfective приезжа́ю ("I arrive / I'm arriving"), the когда́-clause reads as a habitual statement ("whenever I come to Moscow…"), which clashes with the one-time future позвоню́. The cure is mechanical and reliable: if the event is in the future, the verb is in the future, in both clauses. There is no exception to learn, no list to memorize — just unlearn the English present-for-future habit. For a related tense mismatch, see the present perfect trap.
Common Mistakes
❌ Когда́ я приезжа́ю в Москву́, я тебе́ позвоню́.
Wrong — present приезжа́ю reads as habitual ('whenever I come'); a future event needs future прие́ду.
✅ Когда́ я прие́ду в Москву́, я тебе́ позвоню́.
When I arrive in Moscow, I'll call you. — future прие́ду in the subordinate clause.
❌ Е́сли ты ви́дишь Ма́шу, скажи́ ей.
Wrong for a future situation — present ви́дишь; for a one-off future, use the future уви́дишь.
✅ Е́сли ты уви́дишь Ма́шу, скажи́ ей.
If you see Masha, tell her. — future уви́дишь.
❌ Как то́лько он прихо́дит, мы начнём.
Wrong — present прихо́дит is habitual; the one-time future arrival is придёт.
✅ Как то́лько он придёт, мы начнём.
As soon as he arrives, we'll start. — future придёт.
❌ Жди, пока́ я верну́сь.
Incomplete — the 'until' frame needs не: пока́ … не верну́сь.
✅ Жди, пока́ я не верну́сь.
Wait until I get back. — пока́ … не + perfective future for 'until'.
Key Takeaways
- After когда́, е́сли, как то́лько, пока́ referring to a future event, the subordinate verb is future, not present — both clauses future.
- English's present-for-future after these conjunctions ("when I arrive…") does not transfer; Когда́ я приезжа́ю… turns a one-time future into an unwanted habitual.
- Choose aspect normally inside the future clause: perfective for a single completed event (прие́ду, придёт), imperfective compound future for an ongoing action with пока́ (бу́дешь гото́вить).
- пока́ + imperfective future = "while"; пока́ … не + perfective future = "until" — and that не is not a real negation.
- This is a transfer error with a one-line cure: if it's in the future, put the verb in the future, everywhere in the sentence. See talking about the future for the bigger picture.
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- The Perfective (Simple) FutureA2 — The perfective future is a single word: you conjugate a perfective verb with the ordinary present-tense endings (-у/-ю, -ешь/-ишь…) and the result means the FUTURE — прочита́ю 'I'll read (and finish),' напишу́ 'I'll write,' куплю́ 'I'll buy,' позвоню́ 'I'll call.' The trap is that these forms look exactly like a present tense, but a perfective verb has no present, so a conjugated perfective is always future. It names a single completed action with a result, a promise, or one step in a sequence.
- The Imperfective (Compound) FutureA2 — Russian builds the imperfective future from two words: the conjugated future of быть (бу́ду, бу́дешь, бу́дет, бу́дем, бу́дете, бу́дут) plus an imperfective infinitive — Я бу́ду чита́ть 'I'll be reading / I'll read.' Only the auxiliary бу́ду changes; the lexical verb stays in the infinitive forever. It expresses ongoing, repeated, or habitual future action, and it works ONLY with imperfectives (буду + a perfective is ungrammatical). The same бу́ду-forms also mean 'will be' on their own (Я бу́ду до́ма).
- Talking About the Future: All the OptionsB1 — Russian offers five distinct ways to talk about the future, and choosing well is half the battle: the perfective simple future for single completed acts (Я позвоню́), the imperfective compound future for processes and habits (Я бу́ду звони́ть ка́ждый день), the plain PRESENT tense for scheduled or imminent events (По́езд ухо́дит в семь; За́втра я е́ду в Москву́), собира́ться + infinitive for intention ('be going to'), and хоте́ть / плани́ровать / реши́ть + infinitive for wishes and plans. This page maps each to its meaning and gives you a quick way to decide.
- Temporal Conjunctions: когда, пока, после того как, как толькоB1 — Conjunctions of time tell you when one event happens relative to another: когда́ (when), пока́ (while) and пока́…не (until), как то́лько (as soon as), and the compound after/before pairs по́сле того́ как, пе́ред тем как, до того́ как, с тех пор как. The headline rule for English speakers: когда́- and пока́-clauses about the future take the FUTURE tense, where English uses the present.
- Conditional vs Temporal: Если vs КогдаB1 — Е́сли introduces a condition you're not sure about ('if it happens'); когда́ introduces a time you take for granted ('when, as it surely will'). Both put the subordinate verb in the FUTURE where English uses the present (Когда́ прие́дешь, позвони́ — 'When you arrive, call'). Real conditions and presupposed times split on certainty; counterfactuals always use е́сли бы, never когда́.
- The Present Perfect Trap (I have lived here for…)B1 — English uses the present perfect for a situation that started in the past and STILL CONTINUES — 'I have lived here for two years', 'How long have you been studying Russian?', 'I have known him for years'. Because it looks like a perfect, English speakers reach for a Russian past tense — but for an ongoing situation Russian uses the PRESENT (Я живу́ здесь два го́да). Using a past there wrongly implies the situation is over. This is distinct from the perfective past, which is the real 'I have done it (and the result stands)'.