For & Since

Summary: What's the difference between 'for' and 'since'?

By: | Audience: All | Category: English Grammar | Topic: Prepositions

First Published: 12th Dec. 2006 | Last Edited: 25th Jan. 2019


We use for when we are talking about the duration of an action or state:

  • I have lived in London for seven years. (This tells us how long I have lived in London)

For is a preposition here.


We use since when we are talking about when the action or state started:

  • I have lived in London since 1997. (This tells us when I started living in London.)

Since can be a preposition (since five o'clock) or a conjunction (since I met her).

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