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Two Prepositions – 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: We use for + period of time (two hours,

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

We use for + period of time

(two hours, six weeks etc.):

I've been waiting for two hours.

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

since 8 o'clock

8 o'clock April lunchtime

Monday 1985 we arrived

12 May Christmas I got up

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