( 期中考试复习 )Unit 2 Home Sweet Home Grammar Focus 【语法知识复习】 ( 情态动词 can/could can could 用法 句型 用法 句型 表示许可。 Eg ： You can play balls in the yard. 表示 请求 。 Eg ： Can you help me with my maths 肯定句：主语 +can+ 动词原形 + 其他。 eg ： You can watch TV. 否定句：主语 +can ’ t/cannot+ 动词原形 + 其他。 eg ： We can ’ t talk in the library. 一般疑问句： Can+ 主语 + 动原 + 其他。肯定回答： Yes, 主语 +can. 否定回答： No, 主语 +can ’ t 。 eg: — Can you tell me this story — Yes, I can./No, Ican ’ t. 表示 请求，可以和 can 互换，但 could 语气比 can 语气更委婉、客气。 “ Could you+ 动原 + 其他？”用于星球对方做某事。意为“你能 ……吗？” “ Could I + 动原 + 其他？”用于请求对方允许自己做某事，意为“我能……吗？” 肯定回答： Certainly./ Of course./ Yes, sure./ It ’ s OK./...( 不用 could ） 否定回答： Sorry/ No, you can ’ t./... （不用 could ） 问句 回答 )核心用法对比 特别提醒 could 表示过去的能力时，通常指过去泛指的、长期拥有的能力。若要表示“过去某次能够成功做成某事”，通常使用 was/were able to。 例：After hours of effort, they were able to put out the fire. (不能用could) 回答以 Could you... 开头的委婉请求时，不可用 "Yes, I could."，而应用 "Yes, I can." 或 "Sure." 等，因为请求是针对现在行为的。 中考常考考点 语境辨析：在单项选择或完形填空中，根据时间状语（如now, last year）或上下文语境，判断使用表示“能力/许可”的 can 还是 could。 委婉程度：在情景对话中，考查 Could you... 比 Can you... 更礼貌、正式，是高频考点。 否定意义：考查 can't 表示“不可能”的推测意义，以及对 Can I... 的否定回答 No, you can't。 时态区分：在完成句子或句型转换中，考查 could 与 was/were able to 在表示“过去具体某次成功做到”时的区别。 【基础过关】 I. 单项选择 1.— _____ you pass me the salt, please — Sure. Here you are. A. Could B. Can't C. Must D. Should 2. My grandfather _____ drive a car last year, but now he can't because of his poor eyesight. A. can B. could C. may D. must 3. — Mom, can I watch TV for a while — No, you _____. You must finish your homework first. A. couldn't B. mustn't C. can't D. needn't 4. —The problem is very simple. —A child _____ understand it. A. must B. should C. can D. need 5. — I didn't see you at the meeting yesterday. — I'm sorry. I _____ come because I had a high fever. A. can't B. couldn't C. mustn't D. needn't II. 用 can, can't, could, couldn't 填空 6. I'm sorry I _____ help you yesterday. I was too busy. 7. _____ I use your dictionary Mine is at home. 8. He _____ be in the library. I just saw him playing basketball on the playground. 9. When she was young, she _____ run very fast. 10. — _____ you play the piano — Yes, I _____. I started learning when I was six. III. 根据语境或提示完成下列各题，每空一词（含缩略形式）。 11. — Lily, could you pass the paper to me — _____, _____. Here you are. — Could we go to the zoo this weekend — _____ _____. It’s a good place to relax ourselves. — Could you help me do my housework — _____, _____ _____. I'm a little tired. — Could I borrow your bike this afternoon — __ ... ...
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