概要：tter表示"最好",用于表示对别人的劝告、建议或表示一种愿望。缩写形式为 'd better。had better后面加动词原形,否定形式为had better not do sth.表示"最好不做……"。 eg. You look tired. You'd better see a doctor. C、"why not", "why don't you" 和 "perhaps" 表示建议时的用法。 ⑴"why not" 句型常用于说话人向对方提出一个建议, 意思是"何不……?"它和"why don't you"句型为同义句,后面都要加动词原形,即why not do sth? 和Why don't you do sth.? eg. Why don't you go to the cinema with your mother? = Why not go to the cinema with your mother? ⑵"perhaps"表示"可能",一般放在句首向对方提一个建议。 eg. A:I want to be as strong as Tom. B: Perhaps you should exercise more.上一页 [1] [2] [3]

九年级英语上学期Unit5学案,http://www.ketang123.com
    I'm tired. I must go home.(自己主观上的要求)
    ③ have to 的否定形式为don't have to = needn't, 表示不必要;
    must 的否定形式为mustn't表示禁止;不允许;一定不要。
    ⑶had better表示"最好",用于表示对别人的劝告、建议或表示一种愿望。缩写形式为 'd better。had better后面加动词原形,否定形式为had better not do sth.表示"最好不做……"。
    eg. You look tired. You'd better see a doctor.
    C、"why not", "why don't you" 和 "perhaps" 表示建议时的用法。
    ⑴"why not" 句型常用于说话人向对方提出一个建议, 意思是"何不……?"它和"why don't you"句型为同义句,后面都要加动词原形,即why not do sth? 和Why don't you do sth.?
    eg. Why don't you go to the cinema with your mother?
    = Why not go to the cinema with your mother?
    ⑵"perhaps"表示"可能",一般放在句首向对方提一个建议。
    eg. A:I want to be as strong as Tom.
    B: Perhaps you should exercise more.

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