for / since

Use for with periods of time: I’ve been studying English for two years.

  • for…
  • three years
  • two weeks
  • four days
  • five hours
  • ten minutes
  • three decades
  • two centuries

    Use since with measuring the time after a specific point in time: I’ve been studying English since 2010.

  • since.
  • 9:00
  • 1973
  • Monday
  • February
  • last Christmas
  • I was a child
  • I graduated from college

    As you can see from the last few examples, you don’t necessarily need to use a specific date with since. Let’s say I graduated from college in 2004 and now it’s 2014. I could say:

  • I’ve been working at this company since 2004.
  • I’ve been working at this company since I graduated from college.

    Again, since measures backwards to a specific point in time.