情态动词shall,should, must 用法及练习

• 2. should • 1). Children should be devoted to their parents. • 2).You shouldn’t be so careless. ought not to
• 2）比较有依据的推测将来某种情况， ）比较有依据的推测将来某种情况， • “按理说会，估计会” 按理说会，估计会”
• 1) It’s 2:30, They should be here now. • 2) The glasses should be enough for each guest. • 3) We should arrive before dark. • 4) The roads should be less crowded today.
• --- When can I come for the
• • • • • •
photos? I need them tomorrow afternoon. --- They ___ be ready by 12:00. A. can B. should C. might D. need It’s nearly seven o’clock. Jack __ be here at any moment. A. must B. need C. should D. can
• 3. must • ---- Must I do it at once? must ---- Yes, you______. / ----No, youneedn’t _____. don’t have to) (=No, you ___________
• You mustn’t waste any more time. • You must not smoke here.
（规定） 规定）
• 5. Persons under 18 shall not be employed. （规定） 规定）
“The interest(利息 __ be 利息) 利息 divided into five parts, according to the agreement,” declared the judge. A.may B. should C. must D. shall
Modal verbs
1. shall
(1)用于疑问句与第一、三人称连用，表 用于疑问句与第一、三人称连用， 用于疑问句与第一 示征求意见或请求许可。 示征求意见或请求许可。
• 1) Shall we go out for a meal together? • 2) Shall the newcomer have a try?
• 1.--- The room is so dirty .______ we clean it? • ---- Ok. • A will B Shall • C Would D Do
(2)用于肯定句与二、三人称连用，表示 用于肯定句与二、三人称连用，
允诺，决心，威胁，警告， 说话人的 允诺，决心，威胁，警告， 命令，或法律、 命令，或法律、文件的 规定 。
• There __ be any difficulty about passing the road test since you have practiced a lot in the driving school.(05 上海 上海) A. mustn’t B. shan’t C. shouldn’t D. needn’t
• 禁止 不可以 千万别 禁止,不可以 不可以,千万别
• 2) 肯定推测，“一定，准是”（只能用于 肯定推测， 一定，准是” 肯定句） 肯定句）
• 1. She must be tired after such a long walk. • 2. He must be sleeping now.
• ---Hi, Tom. Any idea where Jane is? • ---She _____ in the classroom. I saw her there just now. A shall be B should have been C must be D might have been
• (3)表示惊讶、遗憾、“竟然，居然” 表示惊讶、遗憾、 竟然，居然” 表示惊讶
• I’m glad that his son should have won the first prize. • It’s strange that he should fail again. • You can’t imagine that a wellbehaved gentleman ___ be so rude to a lady. • A. might B. need C. should D. would
• Nothing shall stop me from going there. 决心 • You shall be sorry for what you have done, I tell you.
威胁/警告 威胁 警告
• 3.You shall get an mp5 as your birthday present this year.（允诺） • 4.The fine shall be paid in cash.
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John, look at the time, __ you play the piano at such a late hour? A. Must B. Can C. May D. Need
• 1. Why must you always break in when others are talking? • 2. If you must break the law, of course, you will be punished.
• 1. Trees are good for man. We can’t plant them _____ many. • A so B such • C too D enough • 2. In a rely race, a player can’t run fast _____. • A so B such • C too D enough
(3) must 表示固执 不满 意为“偏偏， 表示固执,不满 意为“偏偏， 不满,意为
偏要,非得” 偏要 非得” 非得
•---- May I smoke here? ---- If you __, choose a seat in the smoking section. A. should B. could C. may D. must