It is used before a noun to say when something happens. But we don't know how long it happened.
- During my trip to Thailand I learned the Thai box movement.
- She will learn in England during the summer.
To precise the beginning of a period of time
- Since the British invasion in the 18th century, the country's economy accelerated.
- We didn't see each other since 1999.
Talk about how long something last
- For a few years people travel more than in the 80's.
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