21.If I (be) ………………..you, I (tell) ……………………..her the truth. 22.Why didn’t you attend the meeting? Oh, I (not know) ………..indeed. If I (know) ………I (come) ……. there. 23.What ……….we (do) …..if they (not come) …………..tomorrow? 24.If you meet him, remember (not tell) ……………….him what I (just say) …………………… to you. 25.If I (have) ………….enough time now, I (write)………to my parents. 26.It’s too bad Helen isn’t here. If she (be) ……………there, she (know) ……………………what to do. 27.If I (not eat) …………………breakfast tomorrow morning, I (get) ……………..hungry during class. 28.I (change) ………….the present economic policy if I (be) ……… the President of the United States. 29.If the weather (be) ……nice today, we (go)……………to the zoo. 30.If I (be) ……..in your position, I (not do) ………………………….that. 31) If we meet at 9:30, we.........................(have) plenty of time. 32) Lisa would find the milk if she..............................(look) in the fridge. 33) The zookeeper would have punished her with a fine if Trang 28 she................................(feed) the animals. 34) If you spoke louder, your classmates....................(understand) you. 35) Dan..............................(arrive) safe if he drove slowly. 36) You.........................(have) no trouble at school if you had done your homework. 37) If you…………..........(swim) in this lake, you'll shiver from cold. 38) The door will unlock if you.........................(press) the green button. 39) If Mel...........(ask) her teacher, he'd have answered her questions. 40) I..........................(call) the office if I were you.

21.If I (be) were you, I (tell) would tell her the truth.

22.Why didn’t you attend the meeting? Oh, I (not know) didn't know indeed. If I (know) knew I (come) will come there.

23.What should we (do) do if they (not come) won't come tomorrow?

24.If you meet him, remember (not tell) not to tell him what I (just say) just said to you.

25.If I (have) have enough time now, I (write) will write to my parents.

26.It’s too bad Helen isn’t here. If she (be) is there, she (know) knows what to do.

27.If I (not eat) won't eat breakfast tomorrow morning, I (get) will get hungry during class.

28.I (change) will change the present economic policy if I (be) am the President of the United States.

29.If the weather (be) was nice today, we (go) would go to the zoo.

30.If I (be) would in your position, I (not do) wouldn't did that.

31) If we meet at 9:30, we will (have) plenty of time.

32) Lisa would find the milk if she would look (look) in the fridge.

33) The zookeeper would have punished her with a fine if Trang 28 she feeded(feed) the animals.

34) If you spoke louder, your classmates would understood (understand) you.

35) Dan arrived (arrive) safe if he drove slowly.

36) You won't had (have) no trouble at school if you had done your homework.

37) If you swim (swim) in this lake, you'll shiver from cold.

38) The door will unlock if you press (press) the green button.

39) If Mel asked (ask) her teacher, he'd have answered her questions.

40) I would call (call) the office if I were you.