1. He _________(work) there for one year./ has worked
He _________(work) there since last July./ has worked
2. He________ (live) in New York for 1 year./ has live
He________ (live) in New York since he left here last year./ has lived
3. He _______(not) _____smoke for a month./ hasn't smoked
He _______(not) _____smoke since he had a cough./ hasn't smoked
4. I _______ (study) with this class for six months./ have studied
I _______ (study) with this class since March./ have studied
5. We _____ (wait) for them for half an hour./ have waited
We _____ (wait) for them since five thiry (now is six o'clock)./ have waited
6. How long _______ you _______(feel) that way?/ have felt
I ______(feel) this way for a week./ have felt
I ______(feel) this way since last Sunday./ have felt