Since

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Since, when used with the present perfect tense, means from a point or period of time in the past up to now.

For

For, when used with the present perfect tense, refers to a period of time up to now.

Ago

Ago is used when you date back from now to a point of time in the past.

Before

Before is used when you date back from any point of time in the past or future.

See also

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

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