1. I __________ (write) an essay since two o’clock.
2. —— You look exhausted!
—— Yes, I ________ (play) tennis and I ________ (not play) for years, so I’m not used to it.
3. This is the third time you _________ (be) here. What exactly you ______ (come) for now?
4. I __________(travel) a lot in America. (= I know America.)
5. I ___________(read) your book. (= I haven’t finished it.)
6. I ___________(read) your book. (= I’ve finished it.)
7. I __________ (work) all day (and I’m tired out).
