Question

suply the present perfect tense of the verbs in parentheses: 1.bob ___my friend for long time.(be) 2.scientist ___to reproduce the formation of crates.(try) 3.He___astronomy since 2012.(study) 4.the kids___the door of the garage.(break) 5.we___to the zoo many times.(go) 6.Helen___a letter to her friend in england.(write) 7.the children___their mother latery.(help) 8.you___to call naney.(forget) 9.bill___very fast recently.(drive) 10.the boys ___sandwiches since yesterday.(eat)

Answer 1

1. Bob has been my friend for a long time.
2. Scientists have tried to reprodude the formation of crates.
3. He has studied astronomy since 2012.
4. The kids have broken the door of the garage.
5. We have been to the zoo many times.
6. Helen has written a letter to her friend in England.
7. The children have helped their mother lately.
8. You have forgotten to call Naney.
9. Bill has driven very fast recently.
10. The boys have eaten sandwiches since yesterday.