Since and For

The words ‘since’ and ‘for’ are often confused by English language speakers. There is a simple rule to follow to differentiate between the usage of these two words.

SINCE is used to talk about time from a specific period while FOR is used to talk about a length of time.

I have been living in Delhi since 1982.
I have been living in Delhi for twenty years.

I have been studying since seven a.m. today.
I have been studying for eight hours.

My tutor has taught me since January this year.
My tutor has taught me for five months.