Unit 3 第3课时 Section A(Grammar Focus～4c)——单元语法精讲精练（作业课件）-【四清导航】2023-2024学年八年级英语下册（人教版 辽宁专用）

第三课时　[Unit 3　Section A(Grammar Focus～4c)] ——单元语法精讲精练 英语 八年级下册 人教版 四清导航 情态动词could的用法 情态动词could可用于有礼貌地向对方提出请求或请求对方的许可，用于疑问句中，可代替can，但语气要比can委婉、有礼貌。其答语没有固定的形式，但要符合上下文的语境。 1．委婉地表示请求别人做某事 常用句型 Could you (please) do sth.？ 肯定答语 Yes, sure./Yes, I can./Of course, I can./No problem./With pleasure... 否定答语 Sorry, I can't. I have to.../Sorry, I'm going to.../I'm afraid I can't. I have to... 2 —Could you please help me clean the room？你能帮我打扫房间吗？ —Yes, sure.好的，当然可以。 —Could you water the flowers？你给花浇一下水好吗？ —Sorry, I can't. I'm going to do my homework.抱歉，我不能。我要做家庭作业。 3 2．委婉地表示请求别人允许自己做某事 —Could I sit here？我可以坐在这里吗？ —Yes, you can.是的，你可以。 常用句型 Could I do sth.？ 肯定答语 Yes, you can./Yes, please.等 否定答语 Sorry, you can't./I'm afraid you can't.(然后说明理由)等 4 【注意】(1)Could you (please) do sth.？和Could I do sth.？这两个句型的答语中一般都避免使用could。 (2)句中could都可换成can。 (3)句中please还可放在句尾，其前用逗号和前面内容隔开。 5 【拓展】could的其他用法： (1)could为can的过去式，表示能力。如： —Could you play basketball when you were 8 years old？你八岁时会打篮球吗？ —Yes, I could./No, I couldn't.是的，我会。/不，我不会。 (2)表示惊讶、怀疑、不相信等态度，主要用于否定句或疑问句，此时could可代替can，但语气比can要弱。如： He couldn't/can't be over fifty.他不可能超过50岁。 Can/Could he be serious？难道他会当真吗？ 6 (3)表示可能性，指对将来、现在或过去某种可能的推测。如： The book could be Mike's. He likes reading science books.这本书可能是迈克的。他喜欢看科学书籍。 The windows are open. He could have come back.窗户是开着的。他可能回来过。 (4)表示建议。如： You could get your sister a scarf as her birthday present.你可以给你妹妹买条围巾作为她的生日礼物。 7 一、选词填空 1．Could you _________ (pass/passing) me the English dictionary? 2．Could you please _________ (no/not) tell others about the secret (秘密)? 3．—My bike is broken. _________ (Should/Could) I use yours? —Yes, sure. 4．—Could I hang out in the park after dinner? —Of course you _________ (can/could). 5．—Could you please cook dinner? —Sorry, I _________ (can't/couldn't). I'm going to do my homework. pass not Could can't can 8 二、根据语境完成下列各题 6．—Could Mike and I go climbing this weekend, Dad? —______________. But be careful. 7．—Mom, could I go out tonight? —__________________. You will have an exam tomorrow. 8．—Could you come to my house after school? —__________________. I must practice the piano tonight. 9．—Could I have one of these apples, Dad? —_____________/_____________. But you must wash your hands before you eat it. 10．—Could you please do the dishes? —_______________ I can't. I have to do my homework. Yes, sure Sorry/No, you can't Sorry/No, I can't Of course No problem I'm afraid 9 三、句子翻译 根据所给中文完成句子翻译。 11．请你不要在教室里大喊好吗？ ____________________ not shout in the classroom? 12．你五岁的时候会做什么？ _____________________ when you were five? 13．我今晚可以玩电脑游戏吗？ _________________ computer games tonight? 14．能请你帮我把门打开吗？ Could you (please) help me (to) open the door? 15．明天上午我们可以去爬山吗？ Could we go to climb the mountain tomorrow morning？ Could you (please) What could you do Could I play 10 一、用方框中所给单词的适当形式填空 borrow　finger　lend　hate 1．Mike _________ to do the dishes because he thinks it's boring. 2．She picked up the sock with two _________, and took it upstairs. 3．Lisa didn't have enough money to buy that skirt, so I _________ her some. 4．David ___________ my new CD yesterday but he didn't give it back to me. hates fingers lent borrowed 11 二、句子翻译 根据所给中文完成句子翻译。 5．我吃完早饭后应该做什么？ What should I do after I ______________________ breakfast? 6．在你写电子邮件的时候，我会完成我的家庭作业。 I will finish my homework ______________________ an e­mail. 7．你能玩电脑游戏，但是你不得不先打扫你的房间。 You can play computer games, but you __________ clean your room first. 8．我妈妈让我晚上八点之后不要与朋友们闲逛。 My mother/mom asked me not to hang out with my friends after 8：00 p．m.． finish having/eating while/when you write have to 12 $$