1)
FOR
six years, three hours, twenty minutes, a day, five months, a long time, eight weeks, thirty seconds
SINCE
March, Tuesday, 2012, the sixteenth century, last week, yesterday, my birthday
2) 2. since
3. for
4. since
5. since
6. for
3)
I've had a dog for two months
I've lived here since 2010
I've been interested in buying that since yesterday
I've known you for a long time
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