| FOR |
- For is used to indicate a period of time.
- How long are you staying in London? I'm staying for a week.
For is often used with the Present Perfect.
- I have been waiting at the bus stop for 10 minutes.
- I have lived in this country for 5 years.
- For can be used with other verb tenses :
- Present : I go on holidays for two weeks every summer.
- Past : When I was sixteen, I stayed in London for two months.
- Future :While I am in the USA , I will be in New York for two days.
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| SINCE |
- 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 January 2010.
- I have been learning English since the beginning of the year.
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| AGO |
- Ago is used to say when past events happened, going back from today towards the past. The verb is in the Past Tense.
- I came to Tokyo two years ago.
- I arrived at the bus stop 10 minutes ago.
- The company was founded 30 years ago.
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