新人教版2015年七年级下册 Unit+4 Section+B.ppt

5. Peter ________ baseball for two hours every day. 6. ━I’ll have an English test tomorrow. ━Good ____. 7. Don’t be ____ to them. They’re too young. 8. You can _____ for an hour after the games. practices luck strict relax 英语·新课标（RJ） Unit 4 ┃ 语法探究 ┃语法探究┃ Ⅰ.祈使句 定义： 用于表达命令、请求、劝告、警告、禁止等的句子叫__________句。 时态： 使用______________时态。 结构： 动词原形＋其他成分＋ please. 否定祈使句在动词原形前面加__________ 。如： Be quiet in the classroom, please. 在教室里请保持安静。 Dont fight. 不要打架。 祈使 一般现在 Don’t 英语·新课标（RJ） Unit 4 ┃ 语法探究 Ⅱ.情态动词have to 和must 1.情态动词have to和must都表示“__________”的意思。have to 表示从__________条件上来看必须做某事；must表示说话人　__________必须要做某事。如： There is no bus, you have to walk home. (没有公交车是客观条件) 没有公共汽车，你必须走回家。 I must study English well. (想学好英语是一种主观想法) 我必须要学好英语。 必须 客观 主观上 Unit 4 ┃ 语法探究 英语·新课标（RJ） have to有__________、__________和__________的变化，而must 只有一种形式。如： He has to stay at home, its raining. 他必须待在家中，下雨了。 3.在否定结构中dont have to表示“__________”， 而mustnt表示“__________”。如： You dont have to wait for him. 你没必要等他。 You mustnt play with fire. Its dangerous. 你禁止玩火。那很危险。 人称 数 时态 不必要 禁止 Section B terrible read dirty kitchen make the bed relax noisy strict follow the rules remember learn keep quiet 1a Match the pictures [a-h] with the rules. ___ go out ___ see friends ___ do his homework ___ practice the guitar ___ do the dishes ___ watch TV ___ help his mom make breakfast ___ clean his room a h c b e g f d 1b Listen and put an x for things Dave can’t do and a√ for things he has to do. Rules Can’t Have to/must go out see friends do his homework practice the guitar do the dishes watch TV help his mom make breakfast clean his room √ √ √ √ x x x √ 1c Listen again. Write when Dave has to follow the rules in the chart in 1b. Choose from the phrases in the box. on school nights on school days every Saturday after dinner before dinner after school in the evening every morning Rules