牛津深圳（广州）版七年级下册Unit 6 Electricity 语法：情态动词知识点+练习（含答案）

中小学教育资源及组卷应用平台 牛津深圳（广州）版七年级下册 Unit 6 Electricity 语法：情态动词 知识点讲解 一、情态动词的含义 情态动词是一种本身有一定的词义，表示说话人的情绪，态度或语气的动词，但不能单独作谓语，只能和其他动词的原形 (?http:?/??/?baike.?/?view?/?2992327.htm?)构成谓语。情态动词数量不多，但用途广泛，主要有下列：can (could), may (might), must, need, shall (should), will (would)。 二、情态动词的特征 有一定的词义，但不能单独做谓语，必须和行为动词和系动词连用构成谓语。 例如：We must stay here. 无人称和数的变化（have to例外，如在一般现在时态下用于第三人称单数时用has to）。 例如：I can sing an English song. Yang Li can also sing an English song. 后接动词原形，即不带to的不定式。 例如：You should do your homework now. 具有助动词的作用，可用来构成否定句、疑问句及用于简单答语。 例句：-- Can you come to my birthday party? --Sorry.I can't.I have to study for my test. 情态动词的用法 1、can,could 的用法 情态动词 用法及含义 例句 can 1.表现在的能力，意为：会，能 We can speak a little English. 2.表请求或许可，意为：能，可以 Can you help me with my English? 3.表有把握的否定猜测，意为：一定不... That can't be Mr. Wang. He has gone to Beijing. could 1.表过去的能力，意为：会，能 He could ride the horse at the age of six. 2.表委婉请求，比can更委婉，疑问句 Could you lend me your dictionary? 3.表无把握的猜测，意为：可能... It could be his eraser, but I'm not sure. 【拓展】辨析：can与be able to can be able to can与be able to 表示能力时，意思相同。 can只有现在时和过去时could，不能表示将来的能力；eg：Roy couldn't swim last year, but now he can. 罗伊去年不会游泳,但现在他会了。 be able to既可表现在或过去能力，又可指将来具备的能力。eg：Kate will be able to drive when she is 18 years old. 凯特18岁时就能开车了。 【即时演练】 1.--It must be John who is in the office. --I’m sure it _____ be John. I saw him off at the railway station just twenty minutes ago. A. won’t B. mustn’t C. can’t D. needn’t 2.--_____ you swim?--Yes, but I’m not a good swimmer. A. Can B. May? ? ? C. Need ? ? ? D. Must 3.--Mum, may I go to see a film with my cousin? --You _____ go if you have finished your homework. A. must B. need C. should D. can 4.Finish your homework first, then you’ll _____ watch TV for an hour. A. can B. be able to C. able D could 5. “What I do for you?” means “ I help you?” A. can; Must B. shall; Need C. can; Can D. will; shall 6. Neither he nor his children able to play table tennis. A. can be B. could C. is D. are 2、may, might的用法 情态动词 用法及含义 例句 may 表请求或许可，意为：可以 You may leave now. 表无把握的推测，意为：可能，也许 This pen may be Cindy's. She likes pink best. 表祝福与愿望，用于祈使句 May you return soon! might 请求或许可，语气比may更委婉 Might I ask you a question? 表推测，意为：可能，可能性低于may He is away from school. He might be sick. may的过去式，意为：可能 She was worried that we might get hurt. 【即时演练】 1.—Do you have any plans for this weekend? —I'm not sure. I _____ go climbing Mount Yuntai. A. must B. need C. may D. can 2. ... ...