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In sentences with since, we normally use present perfect and past perfect tenses in the main clause.

Present and past tenses are also occasionally used. This often happens in the structure It is/was -- since --

Tenses in since-clauses

Since can introduce its own clause. The tense in the since-clause can be perfect or past, depending on the meaning.

See also

During, in and for
Using during
say and tell
See, look at and watch
Sensible and sensitive
What is a sentence?
Shade and shadow
She is ill and she has been ill: difference
Should in subordinate clauses
Since and for
Since as an adverb and a conjunction
Since, as, because and so
Subject - verb agreement: basic rules
Such and such...that

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