For, Since and During
All of these prepositions are used to express time. For and since express lengths of time while during is used to say something happened during a specific time or event.
- I have lived in California since 5 years.
- I lived in New York during 2 years.
For is used to express a quantity of time.
The correct structure is for + a quantity of time.
- ie: I lived in New York for 2 years.
Since is used to say that something has been true or happening since a specific time, date, day or period in the past.
The correct structure is since + a specific time.
- ie: I have lived in New York since 2007.
*Notice: since is normally used with the present perfect or present perfect continuous tense*
During is a bit different. During is used to say that something happened during an event.
The correct structure is during + a noun- usually an event.
- ie: I fell asleep during the movie.
I hope that clears things up. Let me know in the comments.
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