Common errors!
For vs Since
For is used for period of time.
Like;
Ten years, two days, three months, etc
Since is used for point of time
Like;
1992, 14 August, Monday etc
Usage of For
I have been studying English for years.
I have been posting material in CSS forum for 5 months.
Usage of since
I have been studying English since 2003.
I have been posting material in CSS forum since August 2011.
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