Ответы
3 went
4 has gone
5 have forgotten
6 forgot
7 had
8 have been
9 hasn't finished
10 has just gone
11 arrested
12 gave ... have lost
13 was ... has disappeared
14 have improved
Ответ:
3. Mary went to Australia for a while
4. «Where`s Ken?» «He has gone out. He`ll be back in about an hour».
5. I did German at school but I have forgotten most of it .
6. I meant to phone Diane last night but I forgot.
7. I had a headache earlier but I feel fine now.
8. There has been an accident.
9. They have not finished it.
10. «No, she has just gone out»
11. The police arrested three people but later they let them go.
12. Ann gave me her address but I`m afraid I have lost it.
13. It was outside the house. It has disappeared!
14. Do you think I have improved?
Объяснение:
Главное отличие Past Simple от Present Perfect заключается в том, что в первом случае мы говорим о законченном действии в прошлом, без какой-либо связи с настоящим, а во втором – нас интересует именно результат в настоящем времени.