Jawaban:

1. They HAVE CLEANED the car. It looks new again.

2. My grandmother HAS NEVER EATEN bacon in her life. She is a vegetarian.

3. He HAS BEEN a teacher for 10!years and he still enjoys it.

4. I HAD a strange experience last night.

5. They HAVE BOUGHT a new car. They have a car now.

6. She DID thr homework yesterday.

7. He HAS STUDIED chemistry for three years.

8. At present he is reading an English novel, it is the third English novel he HAS READ this year.

9. HAVE you PACKED your bags yet?

10. He WENT abroad last week.

11. This boy HAS NEVER SEEN the sea.

12. I SAW you yesterday at the party.

13. He isn't here, he HAS JUST GONE out.

14. He HAS HAD a bad cold since last week.

15. HAVE you SEEN a good film lately?

16. He HAS LIVED in England since 1970.

17. DID you GO to the cinema last night? No, I HAVEN'T BEEN there for three weeks.

18. HAVE you READ the book yet? I HAVE only JUST BEGUN it.

19. He ALREADY WROTE two songs this morning.

20. He WROTE a lot of poems yesterday.

Penjelasan:

Present perfect dan simple past sama2 menceritakan tentang kegiatan atau peristiwa yang sudah terjadi di waktu lampau, namun ada sedikit perbedaan antara keduanya.

Present perfect ditandai dengan time signal seperti 'since, for...years/weeks, yet'

Simple past, time signalnya lebih jelas, seperti this morning, yesterday, last night, two weeks ago.

Present perfect menggunakan bentuk 'Have/has + Verb 3 (past participle)

Simple past menggunakan bentuk 'verb 2' (past form)

Hope it helps