AGO, SINCE, FOR

[Nguyễn Huỳnh Nhật Linh]

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AGO to SINCE/ SINCE to AGO
SINCE to FOR / FOR to SINCE
Ago and Last are used with the simple past (I moved to Rome five yearsago/last month).
For is used to talk about something that happens/happened over a period of time
· I’ve been painting this wall for three hours.
· We’ve known each other for at least 10 years.
· I've worked in this company for more than 20 years. Since is used when we state when something started.
· I’ve been painting this wall since 8 a.m.
· We’ve only known each other since /Monday / last week/ last month /2005.
· I've worked in this company since 1995.
As a preposition , Since cannot be used with duration.
We cannot say: since 20 minutes , we will say for 20 minutes (duration is expressed with for.)
....

It's been	A long time since I last played football.
FOR
I ......	Haven't played football for ......	A long time.
It's been two years now since he started working for us.
BEEN
He.......has been working for us.......	For two years.
They moved to England nine years ago.
SINCE
It’s ...(been) six years since they .....	Moved to England.
It's four months since I last visited my uncle John.
LAST
The ...	Last time I visited my ....uncle John was four months ago.
Adolf Hitler has been dead for over 70 years.
BEEN
Adolf Hitler ...has been dead since	......1945.
They have been dating for a week.
LAST	Have been dating since last week.
They......

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