Unit 4 语法（知识清单） -2023-2024学年英语六年级下册单元速记·巧练系列（译林版三起）

Unit 4 Road safety 语法梳理：情态动词精讲精练 (含答案) · 情态动词 情态动词本身有一定的词义，是表示语气的单词。但是情态动词不能独立在句子中作谓语,必须和动词原形一起构成谓语。常见的情态动词有 must, can, could, may,should, need 等。 1. 情态动词 must和can 的用法 中文意思 用法 否定形式 must 必须 表示必要或很重要，指因需要、命令或强制而必须做某事 后接动词原形，没有人称和数的变化 must not/mustn't (表示强烈禁止) can 能；可以；会 表示一般能力，指本身具有的能力、体能等 cannot/can't 例句:I must go to the bank and get some money. 我必须去银行取一些钱。 Don't be impatient. I can explain it to you. 不要不耐烦。我可以跟你解释这件事。 Cars must not park in front of the entrance. 车辆不可以停在入口前面。 I can't tell if this is his handwriting. 我无法辨认这是不是他的笔迹。 2.含有情态动词的不同句式的句型结构 (1) 肯定句：主语+情态动词+动词原形(+其他). 例句: You should be more careful when driving. 你开车时应该更加小心。 (2) 否定句：主语+情态动词+not+动词原形(+其他). 例句: The report may not be complete. 这份报告可能不完整。 (3) 一般疑问句：情态动词+主语+动词原形(+其他)? 例句: —Must I go to see the doctor? 我必须去看医生吗? —Yes, you must. 是的,你必须去。/No, you needn't. 不,你不必。 易错提示►对由 must开头的一般疑问句进行否定回答，答句中的否定词要用needn't, 而不用 mustn't。 (4) 特殊疑问句：特殊疑问词+情态动词+主语+动词原形(+其他)? 例句: What could the little boy do six years ago? 这个小男孩六年前会做什么? · 专题训练 一、从方框中选择合适的单词填空。(可重复使用) 1. You ________go to bed before 8 o’clock. Don’t be late. must mustn't can can't 2. Listen! You ________ chase each other around the classroom. 3. We ________ wait any longer! We should do something. 4. —Mum, ________I play with my toy now? —No, you ________. You ________ practise playing the piano first. 二、单项选择。 ( )1.-- I speak to Mary? --Yes, speaking. A.Must B.Need C.May ( )2.This maths problem is too hard. Nobody do it. A.may not B.may C.can ( )3.--Can you speak Japanese? --No, I . A.can't B.mustn't C.may not ( )4.The children be careful because the floor is wet. A.must B.can C.need ( )5.--Must we finish all these articles this morning? --No, you . A.mustn't B.haven't C.don't have to ( )6.You go and see a doctor at once because you've got a fever