For and Since

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For and Since for Time

We often use for and since when talking about time.

for + period

A period is a duration of time, for example: 5 minutes, 2 weeks, 6 years. For means "from the beginning of the period until the end of the period." For can be used with all tenses.

since + point

A point is a precise moment in time, for example: 9 o'clock, 1st January, Monday. Since means "from a point in the past until now." Since is normally used with perfect tenses



For can be used with all tenses. Here are a few examples:
They study for two hours every day.
They are studying for three hours today.
He has lived in Bangkok for a long time.
He has been living in Paris for three months.
I worked at that bank for five years.
Will the universe continue for ever?



http://www.englishclub.com/grammar/v..._for-since.htm
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