In Your Words...

Thursday, October 18, 2012

Since vs. For with Present Perfect


Since is used with the present perfect to express that something has happened since a point in time.
I've lived here since 1999.
She's been working hard since two this afternoon.

For is used with the present perfect to express that something has happened for a period of time.
I've worked at this job for 10 years.
Peter's been playing tennis for two hours.