11. He (not finish) hasn't finished yet. He only (start) started an hour ago
12. Have you (be) been here before? Yes, I (spend) spent my holiday here last week
13. Don’t speak until you (speak) spoken to
14. The man who (bite) had been bitten by a snake (give) was given some serum
15. Have you decided what (cook) is cooking yet?
16. Your hair looks different. Did you (have) have your hair cut?
17. He knows quite a lot of English. He (study) has studied it for 6 years
18. How do I look in this dress? Is it (suit) suitable for me?
20. We watched the man (dive) divied into the sea
21. I heard Tom (shout) shout : “Take care!”