Unit 5 Green neighbourhood语法精讲精练（含解析） 情态动词 关于情态动词can, could, may, should, must的语法讲解，具体信息如下： 一、情态动词基本性质 情态动词属于助动词，不能单独使用，需要和其后的动词原形一起构成句子的谓语。 二、各情态动词功能及示例 can 1.表示能力：表示某人有做某事的能力。 I can use plastic bottles to make works of art （我能用塑料瓶制作艺术品 ） 2.提供劝告或建议：向他人提供建议。 We can tell people to put plastic bottles in the recycling bin. （我们可以告诉人们把塑料瓶放进回收箱 ） 3.表达询问或请求：请求他人做某事或给予某物。 Can you help me with this box （你能帮我搬这个箱子吗？ ） Can I have a bottle of water, please （请问我能喝瓶水吗？ ） 4.表示允许：表明某人被允许做某事。 The battery is full. Can I unplug the charger （电池充满了。我能拔掉充电器吗？ ）；You can't litter here.（你不能在这里乱扔垃圾 ） could 1.表示过去所具备的能力：说明过去有做某事的能力。 Jane could make a cloth bag out of her old green T-shirt at the age of seven.（简七岁时就能用她的旧绿T恤做布袋了 ） 2.表达询问或请求：礼貌地询问是否能做某事。 Could I open the window to make the room bright （我能打开窗户让房间亮些吗？ ） 3.提供劝告或建议：给出建议。 We could save paper by writing on both sides. （我们可以通过在纸的两面书写来节约用纸 ） may 1.表达可能性：表示某事有发生的可能性。 I may be late for the school cleaning activity.（我可能会迟到学校的清洁活动 ） 2.表达礼貌的询问或请求：礼貌地询问能否做某事 May I turn off the lights （我可以关灯吗？ ） 3.表达许可：表示某人被允许做某事。 You may go there by underground rather than by car.（你可以乘地铁而不是开车去那里 ） should 1.纠正他人：指出他人说法或做法的错误。 A: Mary is a good typewriter. B: You should say "typist". （A：玛丽是个好打字机。 B：你应该说“打字员” ） 2.提供劝告或建议：给出建议。 We should take a shower instead of a bath to save water. （我们应该用淋浴而不是盆浴来节约用水 ） must 1.谈论或询问义务：涉及必须履行的义务。 We must always be careful with electricity.（我们必须一直小心用电 ） 2.制定规则和发布指令：制定规则、下达命令。 You must not park in front of the entrance.（你禁止在入口前停车 ） 3.表示“肯定”的猜测：基于逻辑做出肯定推测。 You must be tired after a long walk.（走了很长一段路后，你肯定累了 ） 语法精练 一、单项选择（每题1分，共20分） 1. —_____ you play the guitar I need someone for the school show. —Yes, I can. A. Can B. Could C. May D. Must 2. You _____ eat too much junk food. It's bad for your health. A. can't B. mustn't C. shouldn't D. may not 3. —_____ I borrow your dictionary Mine is at home. —Sure. Here you are. A. Must B. May C. Should D. Need 4. When I was ten, I _____ swim, but I can swim very well now. A. can't B. couldn't C. mustn't D. shouldn't 5. We _____ turn off the lights before we leave the classroom. It's a good habit. A. can B. may C. should D. could 6. Look at the sky. It _____ rain. We'd better take an umbrella. A. can B. may C. must D. should 7. —_____ you help me with my math problems They're too difficult. —Sure! Let me have a look. A. Can B. Must C. Shoul ... ...
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