Listen! I (think) ………………think………….. someone (knock) ……………………is knocking…….. at the door.
2. Up to the present, we (write) …………have been writing……………….. almost every lesson in the book.
3. The earth (circle) …………circles………………..the sun once every 365 days.
4. The farmers (work) …………are working……………….. in the field at the moment.
5. How many times you (see) ……………have you seen……………..him since he went to Edinburgh?
6. Rivers usually (flow) …………flow……………….. to the sea.
7. Look! The boy (cry) …………is crying………………...
8. Do you know that man, who (smoke) ………is smoking………………….. there?
9. Mrs Green always (go) …………goes……………….. to work by bus.
10. We (be) ……………are…………….. from France. We (be) ………………have been…………..there for 20 years.
11. That house (belong) ………belongs………………….. to Mr. Green.
12. Mai (lose) ………lost………………….. her dictionary.
13. I (be) …………am……………….. sorry. I (forget) ………………have forgotten………….. that girl’s name already.
14. I (wait) ……………have been waiting……………..for the manager for two hours.
15. You (ever, see) ………Have you ever seen………………….. a lion?