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初中英语语法之情态动词初中英语语法大全之情态动词①常见的情态动词有：can (could) , ___y (might),must ,shall (should), will (would), dare (dared) , need等,另外,have to、had better也当作情态动词使用。
情态动词后面必须加动词的原形。
②can表示体力、脑力方面的能力或客观的可能性。
口语中, 在询问或说明一件事可不可以做时,常用“can”代替“ ___y”。
情态动词“can”的过去式是“could”,否定式是“cannot”通常缩写成“can’t”,“could”的`否定式是“could not”,通常缩写成“couldn’t”。
如：Can I help you?(要帮忙吗？)/ He can swim.(他会游泳)/ That can’t be Mr Li.(那不可能是李先生)③ ___y表示允许、请求或可能性,用 ___y提问时,肯定回答一般用Certainly或Yes,you ___y.;否定回答一般用can’t或mustn’t. 如：May I ask you a question?—Certainly.(可以问你一个问题吗？当然可以)/ You ___y go now.(现在你可以走了)/ It ___y be in your pocket.(它可能在你的衣袋里)④ must表示“必须”、“一定”的意思。
表示“必须”时否定形式是mustn’t；表示“一定”时,否定形式是“can’t”如：We must be very careful when we cross the road.(我们过马路时一定要非常小心)/ It must be Jack.(那准是杰克)/ I haven’t seen Kate today. She can’t be here.(我今天没有看到过凯特,她不可能在这里)[注意]用must(必须)进行提问时,肯定回答用must,否定回答用needn’t；用must(一定)进行提问时,肯定回答仍用must,但是否定回答用can’t.如：Must we clean the room before we leave?–Yes,you must.或No,you needn’t.(我们走之前必须要打扫 ___吗？是的,必须打扫。
一、选择题 1．— I would like________ to see a movie. — It’s too late. You’d better ________alone. A．to go, go B．go, not go C．to go, not go D．going, go 2．You run with the train when it is coming. It’s dangerous. A．may not B．mustn’t C．needn’t 3．—Must I finish the work today, Mum? —No, you ________.You can finish it tomorrow. A．mustn't B．can't C．shouldn't D．needn't 4．You have finished most of the work, so you ____ start working so early tomorrow. You may come at 9 :00. A．can't B．mustn't C．needn't D．couldn't 5．—Can we walk across the road now? —No, we . We have to wait until the light turns green. A．couldn’t B．needn’t C．shouldn’t D．mustn’t 6．—Jenny, you _________ push your way onto the bus. —I’m really sorry about it. A．mustn’t B．needn’t C．may not 7．—Can I take some milk and biscuits to the reading room? —No, our school has a rule that students _______ eat or drink there. A．can’t B．mustn’t C．needn’t D．may not 8．—Tom, we’re going shopping at eight, right? —Yeah, but I ______ be a little late, so don’t wait for me. A．may B．should C．mustn’t 9．—How nice the building is! What is it for? —It ________ a hotel. But I’m not sure. A．must be B．have to be C．may be D．can be 10．—I’d like ________ Guo Jingming’s Tiny Times. —You had better________ his books. The stories he tells are far from real life. A．buying, don’t read B．to buy, not read C．buying, not read D．to buy, not to read 11．—Susan, someone is waiting for you on the phone. It_______ be your sister, but I’m not sure. — Oh, please tell her to call me_______ because I’m busy now. A．might; later B．must; later C．might; late D．must; late 12．—Could you help me download some Taylor Swift’s songs from Ku Gou? —Sorry, people download music from the Internet without paying, because it’s against the law. A．wouldn’t B．needn’t C．mustn’t D．couldn’t 13．—Can you come to my party on Saturday afternoon? —Sorry, I can’t. I ________ meet my friends. A．can’t B．might have to C．needn’t 14．-Could you help me with my English homework, Nancy? -Of course I____________. Glad to help. A．could B．can C．must D．do 15．It is 11:00 p.m now. Peter hasn't come back yet. His mother ______ be very mad at him. A．may B．can C．must D．need 16．— May I have some wine? — No, you . You have to drive home later. A．shouldn't B．needn't C．mustn't D．may not 17．—________ I borrow the books from the library, Miss Yang? —Sorry, you________. These books are only for members of the English Club. A．Can; couldn’t B．Could; can’t C．Could; couldn’t D．Can; needn’t 18．(2017·甘肃白银·10)—I wonder if these are Danny's glasses. —They________be Danny's. He doesn't wear glasses. A．can't B．must C．mustn't D．can 19．-_________ you help me with my homework? -Of course if I __________. A．Could; could B．Can't; can C．Could; can D．Can; could 20．When I write down what I am showing thanks to, it’s always for things that money ______buy. A．needn’t B．shouldn’t C．may not D．can’t 21．— Mum, I’ve signed for a big box by Future Express (快递). What’s in it? — I’m not sure. It ________be a present from your brother. A．need B．must C．may D．will 22．—Doesn’t Frank like staying at home and looking after his little sister? —_______, but he ________ because both of his parents work. A．Yes; has to B．No; has to C．Yes; doesn’t have to D．No; doesn’t have to
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一、选择题 1．C 解析：C 【解析】 【详解】 句意：——我想要去看电影。——太晚了。你最好不要独自一人去。 本题考查非谓语动词。to go是动词不定式，go是动词原形，going是现在分词或动名词，would like to do sth想要做某事，因此第一空用to go。had better (not) do sth最好（不）做
某事，根据It’s too late.可知，太晚了，因此不要独自一人去，用not go，故选C。 2．B 解析：B 【解析】 【详解】 句意：火车来的时候你不能跟它一起跑，这很危险。 考查情态动词。may not可能不；mustn’t不能，表禁止；needn’t不需要。根据“It’s dangerous”及语境可知，此处是表达“你不能跟着火车跑”，在这儿应是不允许，强烈的禁止
的意思，故用mustn’t。故选B。 3．D 解析：D 【解析】 【详解】 句意：-我必须今天做完这个工作吗，妈妈？-不，你不必。你可以明天完成。 mustn’t禁止，不要；can’t不能，不会；shouldn’t不应该；needn’t不必，没有必要。Must的一般疑问句，肯定回答用must，否定回答应用needn’t。故选D。 4．C 解析：C 【解析】 【详解】 句意：你已经完成了大部分工作，所以你明天不必这么早就开始工作。你可以9点来。 本题考查情态动词。can't不可能，mustn’t禁止，needn’t不必，couldn’t可能不。根据You have finished most of the work可知，你已经完成了大部分工作，因此明天不必这么早就开
始工作，因此用needn’t，故选C。 5．D 解析：D 【解析】 【分析】 【详解】 句意：-我们现在能过马路了吗？-不，我们不能，我们要等到交通灯变绿。couldn’t不能；needn’t不需要，不必；shouldn’t不应该；mustn’t禁止，不要。根据句意We have to wait until the light turns green可知，在红灯的时候是禁止过马路的，因此这里的语气比较强，
故应选D。 6．A 解析：A
