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Present tenses in time clauses

In time clauses, we do not use will or be going to immediately after some time words and phrases.We use a present tense (present simple, present continuous or present perfect) to talk about the future.

Time words and phrases Example
when It'll be wonderful when scientists find/have found a cure for cancer.
as soon as Let me know as soon as your new computer arrives/has arrived.
before It'll be several years before we send/we've sent a manned mission to Mars.
after Let's go for a pizza after we go/have been to the natural history museum.
until / till The rocket won't be launched until they do / have done a final check.
while Think of me while you travel/are travelling to the Moon!
once We'll stop for petrol once we pass / we've passed Cambridge

Form - Expressing the future: future perfect continuous Form - Prepositions of time and place


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