Present Perfect - For and since



We use Present Perfect tense to talk about action which started in the past and continues up to the present.
Examples
   I have had this computer for about a year.
   How long have you been at this school?
   I haven't seen Julia since September.




We use for with a period of time, for example: a few days, half an hour, two years. We use since with the time when the action started, for example: last year, June 8, I met you.

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