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Uses of “for and since”

"For" and "since" are both prepositions that can be used to indicate a point in time or a duration of time. So, in the present perfect tense, "for" is used to indicate the duration of an action up to the present moment, while "since" is used to indicate the starting point of an action that has continued up to the present moment.



Examples:

Present Perfect Progressive

· I have been studying for three hours. (This means that I started studying three hours ago and I am still studying now).

  •   I have been living in this city since 2010. (This means that I started living in this city in 2010 and I am still living here now).

Present perfect

  • I have known you since you were a kid. (This means that he met him when he was a child and they still know each other).
  • She has lived here for twenty years. (This means that she lived in a place for twenty years).









 

 

 

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