FOR/SINCE
My students often struggle with choosing between these two prepositions, which are typical for present perfect tense. Here's what I use to help them understand J
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We use for + period of time (two hours, six weeks etc.):
I've been waiting for two hours.
Two hours ago now
two hours a long time a week 20 minutes six months ages five days 50 years years |
We use since + the start of a period (8 o'clock, Monday, 1999 etc.):
I've been waiting since 8 o'clock. 8 o'clock now
8 o'clock April lunchtime Monday 1985 we arrived 12 May Christmas I got up |