Finish each of the following sentences in such a way that it means the same as the sentence printed before it. 86. Peter hasn’t had his hair cut for over 3 months. @ It is over……………………………………………………………………………………………………… 87. People will only become aware of the problem if you increase the publicity………………. @ Only if ……………………………………………………………………………………………………….. 88. Scientists have tried very hard to find a cure for AIDS. @ Enormous……………………………………………………………………………………………………. 89. Success depends on hard work. @ The harder…………………………………………………………………………………………………… 90. If you changed your mind, you would be welcomed to join our class. @ Were you…………………………………………………………………………………………………….

86. It is over three months since Peter last had his hair cut.

( It is [time] since sb did sth: đã bao lâu kể từ khi ai đó làm điều gì)

87. Only if you increase the publicity will people become aware of the problem.

(Đảo ngữ: Only if [clause] aux V [clause]: Chỉ khi... thì)

88. Enormous effort has been made to find a cure for AIDS.

(Các nhà khoa học đã rất cố gắng tìm ra cách chữa khỏi bệnh AIDS.=Những nỗ lực to lớn đã được làm ra để chữa khỏi bệnh AIDS)

89. The harder you work, the more successful you are.

(The comparative + clause , the comparative+ clause: Càng...càng...)

90. Were you to change your mind, you would be welcomed to join our class.

(Cấu trúc đảo câu điều kiện loại 2: Were S to V, S would V)