Use of For and Since in English



Use of For:
For is going to be used to describe the period.(Duration of time)

Use of Since:
Since in going to be used to describe specific point in time.

Some people think that they are not supposed to use since when a number is concerned. This is not true. You can use since for a number, but it should be in specific point in time. It should not be used to describe the duration of time.

I have not eaten since 4 a.m. (Specific point in time)
I have not eaten for the last 4 hours (Duration)






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