【创新设计】2016-2017学年高中英语 Unit 1 Festivals around the world Period Three Grammar Writing课时作业 新人教版必修3.doc

Period Three　Grammar Writing Part One　Grammar 用适当的情态动词填空 1．He shall have the book when I finish reading. 2．Even an experienced teacher can make mistakes. 3．Let’s speed up.They might be waiting for us now. 4．You can’t be hungry already—you had lunch only two hours ago! 5．Would you please post the letter for me? 6．—Must I finish the work today? —No，you needn’t. 7．Drivers mustn’t drive after drinking. 8．She promised to come by 12.She should be here at any time. 情态动词(Ⅰ) 1．can和could的用法 (1)表示能力，常译为“能，会”，could主要指过去时间。 Little Maggie can dress herself now. I could drive a car before I left school. (2)表示猜测“可能”，一般用于疑问句和否定句。 —Can the news be true? —It can’t be true. Someone is knocking at the door.Who could it be? (3)表示请求、允许(表请求时，口语中常用could代替can使语气更委婉，回答时用can)。 —Could I come to see you tomorrow? —Yes，you can.(否定答语可用No，I’m afraid not.) (4)表示惊异、怀疑、不相信的态度(主要用在否定句和疑问句中)。 How can that be true？I can’t believe my eyes and ears. How could you be so careless? (5)can可以表示理论上的可能性，指常有的行为或情形，意为“有时会……”。 It can be very hot here in summer. (6)“can (could)＋have＋过去分词”的疑问或否定形式表示对过去发生的事情的推测。could have done还可表示过去本来可以做的事而没做。 He cannot have been to that town. Can they have left so soon? 2．may和might的用法 (1)表示许可、请求、允许时，might比may的语气更委婉一些，否定回答时要用mustn’t，表示“不可以”、“禁止”、“阻止”之意。 You may drive the car. —May I use your telephone? —Yes，you may./No，you mustn’t. (2)may常用于祈使句中表示祝愿。 May you succeed! (3)表示推测、可能(疑问句不能用于此意)。 He may be very busy now. (4)“may (might)＋have＋过去分词”表示对过去发生的行为的推测。 He may not have finished the work. 3．will和would的用法 (1)表示请求、建议等，would比will委婉客气。 Would you pass me the book? (2)表示意志、愿望和决心。 I will never do that again. They asked if we would do that again. (3)would可表示过去反复发生的动作或某种倾向。would表过去习惯时比used to正式，并没有“现已无此习惯”的含义。 Mum would tell us stories before we went to bed. 4．shall和should的用法 (1)shall用于主语为第一、第三人称疑问句中，表示说话人征求对方的意见或向对方请示。 Shall we begin our lesson? When shall he be able to leave the hospital? (2)shall用于主语为第二、三人称的陈述句中，表示说话人给对方命令、警告、允诺、威胁等。 You shall fail if you don’t work harder.(警告) He shall