1.祈使句 giving instructions
看例句，總結規律
Please come earlier next time.
Stop talking, please.
1）肯定祈使句：用動詞原形開頭，可通過please使命令的口氣變得客氣一點。
Please可放在句首，或放在句尾時，通常用逗號與句子的前面部分隔開。
2) 否定祈使句：用Don』t + 動詞原形。
3）祈使句的反意疑問句
Put the book over there, will you?
Don』t leave your pet alone, will you ?
Let』s clean the fish tank, shall we ?
2.「must」 &「should」
情態動詞must意為「必須」,表示一種義務，主動去承擔.否定mustn』t表示「不許可」,表示一種禁止.疑問式的否定回答常用 「needn』t」.
---Must I finish the work today?
---No,you needn』t.
情態動詞should意為「應該」，否定形式為「shouldn't"意為「不該」，他們都用來向別人提出建議，告訴別人最好做哪些事或做那些事是正確的。
中考相關語法鏈接
1. Cars, buses and bikes _____ stop when the traffic light is red.
A. can B. must C. may D. need
2. --_____ I fill in the form now , sir?
--No, you needn』t. You can complete it this afternoon.
A. May B. should C. Must D. Would
3. _____ I have to show the school report to my parents, Miss King?
A. Must B. Do C. Can D. May
4. –Look ! Mr Hu is on the other side of the street.
-- It ______ be him. He has gone to Shanghai.
A. mustn』t B. can』t C. shouldn』t D. won』t
5. – Don』t play on the road again, will you?
-- ________.
A. Yes, I don』t. B. No, I won』t.
C. No, I will D. Yes, I won』t.
6. Let』s not pull its tail, shall we?（反意疑問句）
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