15. present perfect with for and since(for&since와 함께 쓰이는 과거완료)
① Form
* 단순 과거 : I started studying here five years ago.
* 단순 현재 : I study here now.
* 과거 완료 : I've studied here for five years.
Not I am studying here for five years.
* 단순 과거 : I met Tom for the first time in 2007.
* 단순 현재 : I stell know him.
* 과거 완료 : I've Known Tom since 2007.
Not I know Tom since 2007.
② Use
* I've lived here since 2005.
* I've lived here for five years.
* They have been married for two years.
* Judy has liked History since she was six.
* We haven't had a holiday since Easter.
* I haven't seen you for a while. How are things going?
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