Time clause
Definition
A time clause is a dependent adverbial clause that shows when one event happens in relation to another. Common linkers include when, before, after, while, until, once, and as soon as.
Examples
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Call me when you arrive.
The clause states the time of the call.
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Maya checked the doors before she left.
The clause places the leaving after the checking.
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While Leo was cooking, Maya set the table.
The clause shows two actions occurring during the same period.
Time clause vs. time phrase
We will leave after lunch.
The prepositional phrase contains no finite verb.
We will leave after everyone finishes lunch.
The clause contains the subject everyone and finite verb finishes.
A time phrase gives temporal information without a clause structure. A time clause contains a subject and finite verb.
Future time clauses normally use a present form
When the main clause refers to the future, the time clause normally uses a present form rather than will. The future meaning comes from the relationship between the clauses.
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I will call you when I arrive.
Use present simple arrive in the future time clause.
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We will wait until Maya has finished.
The present perfect can emphasize completion before the future action.
Common mistakes
I will call you when I will arrive.
I will call you when I arrive.
Use a present form in an ordinary future time clause.
Before leave, check the windows.
Before you leave, check the windows.
A finite time clause needs a subject and finite verb.
Quick check
Question 1 of 3
Which expression is a time clause?
The expression contains the subject the meeting and finite verb ends.Which future time sentence is correct?
Use present simple in the future time clause.Which sentence shows two actions happening during the same period?
While presents the actions as overlapping in time.Nice work — you've completed the quick check.
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