Question

Supply the present perfect tense of the verbs in parentheses.
1. Meteors _______________________ (crash) against the surface of the moon.
2. The moon ______________________(be) a mystery since the beginning of civilization.
3. Scientist _______________________( try) to reproduce the formation of craters.
4. Men ______________________( send) many astronauts to the moon.
5. He _____________________( study) astronomy.
6. The kids ________________( break) the door of the garage.
7. We __________________( go) to the zoo many times.
8. Helen ___________________( write) a letter to her friend in Holland.
9. The children ________________( help) their mother lately.
10. You __________________( forget) to call Nancy.

Answer 1

1. have been crashing   2. has been   3. has tried   4. have sent  5. has studied    6. have broken

7. have gone     8. has written   9. has helped  10. have forgotten