since (point in time) vs for (length of time)

1. A.
   you since last year
2. B.
   me for last year
3. C.
   you about last year
4. D.
   you for last years

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1. A.
   study from two o’clock
2. B.
   studying since two o’clock
3. C.
   studying two o’clock
4. D.
   study for two o’clock

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1. A.
   from two hours
2. B.
   for two hours
3. C.
   by two hours
4. D.
   since two hour

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