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For/since

The words for and since are used in sentences where the speaker wants to talk about something that started in the past and continues into the present.

For is used when specifying the amount of time (how long):

Since is used when specifying the starting point:

Note: The present perfect or present perfect continuous are needed in such sentences. It is wrong to say:

- I know her for two years.  icon
- I know her since 2006.  icon

Do a quiz on this grammar topic.


Frankfurt International School: Art and artists. (Click to see at full size.)