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本节目标：一般过去时(5))
一、定义：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， 只能和其他动词原形构成谓语。 can, could, have to , should, must 等等。 二、 can 表示能力，翻译成： 能，会 could 是can的过去式，表示“过去的能力”。 can not = can’t, could not = couldn’t Eg. (1) I _____ swim, but I _________ swim last year. 我会游泳，但是去年我不会游泳。 (2)The girl _______ play the piano very well, but she _____ do it three years ago. 这个女孩现在弹钢琴弹得很好，但是在三年前她不会弹。 A. can’t B. couldn’t C. can D. could 答案：C B C B 二、情态动词没有人称和数的变化,情态动词后接动词原形。 Eg.(1) I can swim. (2) She can dance to disco. (3) Tom can play the guitar. (4) They could swim last year. 三、当情态动词 can 或 could 表示许可或请求许可时， 这时候用could 语气更委婉、客气，而不是表示过去。 eg. (1) Can I watch TV now? 我现在能看电视吗？ (2) Could you help me? 你能帮我吗？ (3) Could you please tell me the way to the hospital? 你能告诉我去医院的路吗？
闯关练习： 1.Jane _____ speak Chinese well now, but she ______ only speak it a little last year. A. could, can B. can, could C. can, couldn’t 2. Jane ____ play the guitar, but she _______ do it two years ago. A. can, could B. could, can’t C. can, couldn’t 3. --- Can she _______? ---No, she ______. A. swims , can’t B. swim, can C. swim, can’t 4. She ______ play the piano when she was 5. A. can B. could C. can’t 5.---What _____ you do when you were 10? --- I could play the guitar, but I _______ swim. A. can could B. could, could C. could, couldn’t 答案： BCCBC |
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