2,..having said..
=> sau denied + Ving
=> Phu nhan dieu gi
4,..him for being rude to him yesterday
=> apologized + for + Ving
=> xin loi vi da lam dieu gi
11, ..having borrowed my car...
=> admit + Ving
=> Thua nhan da lam gi
13, If you do not work hard, you will..
19, If I had time, I would learn
=> Trai voi hien tai
=> Dung cau dk loai 2

21. My friend came to see me yesterday.
22. I was talking about him when he suddenly came in.
23. Have you finished your homework yet?
24. By the time he stops he had driven six hundreds miles.
25. He hasn't finished it yet. He only started it one hour ago.
26. Henry had lived in New York for ten years before he moved to Chicago last moth.
27. By the time you get there, they have gone home.
28. They don't do anything important at the moment.
29. She didn't understand the question yesterday.
30. At 7.00 pm yesterday I watched TV.
31. They would be glad if the rain will be stop soon.
32. She will be angry if you don't tell the truth.
33. If we had gone to London, we would have seen.
34. If Jack came to my party, i would have danced with him.
35. If he has drove more carefully, he would not cause an accident.
36. If he doesn't go back now, he will be late.
37. If they talk their medicine, they will feel better.