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For - since - ago
are used to talk about time
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For
is used to say how long an
action or situation lasts.
*For
is used with the Present Perfect :
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I have been waiting at the bus stop for 10 minutes.
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I have lived in this country for 10 years.
*For
can also be used with other tenses :
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Present : I go on holidays for two weeks
every year in the summer.
- Past : When I was sixteen,
I stayed in London for two months.
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Future : During my trip to California next
month, I will be in San Diego for two days.
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Since
is used to refer to the starting point
of actions or situations.
It is generally used with the Present Perfect.
* I have been waiting for the bus since 8 o'clock.
* I live in
Tokyo. I have lived in Tokyo since September 2000.
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Ago
is
used to say when past events happened, going back from today
towards the past.
* I came to
Tokyo three years ago.
* I arrived
at the bus stop ten minutes ago.
* I visited
New York two years ago.
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