Future Time Clauses Exercises

A future time clause is a clause that begins with a time word such as when, as soon as, before, after, until, or once and refers to a future event. The important rule is: use the present simple in the time clause, even though you are talking about the future. The main clause uses "will" or "going to." For example: "When she arrives, I'll tell her the news" — not "When she will arrive." This rule surprises many learners because it feels wrong to use a present tense for a future event.

This rule also applies to if in first conditional sentences: "If it rains, we'll cancel the picnic" — not "If it will rain." The logic is the same: the time or condition clause describes something certain to happen at some point, so English treats it as a fact using present tense. Other common time words that follow this rule include while, by the time, and the moment. Note: "when" in a question is different — "When will she arrive?" is correct because "when" is asking a question, not introducing a time clause. This grammar point is tested in every major English exam.