八年级英语上册 第24期课件 牛津深圳版.ppt
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1、第24期,语法运用 Grammar in use一、if引导的条件句我们在七年级时已经学过结构为 “主句用一般将来时, if引导的从句用一般现在时” 的条件句来谈论可能发生的事件。if从句的一般现在时用于表述可能发生的动作或情况, 主句用一般将来时表述条件成立时可能产生的结果。,例如:1. If you walk along the road, you will see many buildings. 如果你沿着这条 路走, 你会看见许多建筑。2. You will not feel tired in the morning if you go to bed early at night. 如
2、果你 晚上早点睡, 你早上就不会感到累。,今天, 我们来学习if条件句用来表示条件和结果之间存在必然联系的用法。当表示客观事实、结果时, if条件句的主句和从句都用一般现在时。1. If you hit the window with a hammer, it breaks. 如果你拿榔头砸窗户, 它会破裂。2. The room becomes bright if you turn on the light. 如果你打开灯的话, 房间会变明亮。,【语法笔记】1. if从句可以放在句首, 也可以放在句末。 如果把if从句放在句首, 常用逗号将其与主句分开。例如:If the temperatu
3、re is below zero, water turns into ice. Water turns into ice if the temperature is below zero. 如果温度低于零摄氏度, 水就会变成冰。,2. if引导的条件状语从句中通常不用一般将来时。在需要表达将来含义时, 一般用现在时表示。,二、if not和unless1. ifnot和unless都可以用来引导条件状语从句, ifnot表示 “如果不”, 而unless表示 “除非”。当它们引导条件状语从句时, 可以互相转换。,例如:If you dont finish your homework, I wo
4、nt let you play outside. 如果你不完成你的作业, 我不会让你出去玩。= Unless you finish your homework, I wont let you play outside.除非你完成你的作业, 否则我不会让你出去玩。,2. ifnot和unless引导的从句和主句的位置可以互换。但是当从句在前, 主句在后时, 一般用逗号隔开, 反之, 则不用逗号。If she doesnt start off now, she will be late. She will be late if she doesnt start off now.如果她现在不出发,
5、她会迟到。Unless she starts off now, she will be late. She will be late unless she starts off now.除非她现在出发, 否则她会迟到。,【语法笔记】1. 在unless引导的从句里, 通常用现在时表示将来。例如:Unless you have a better idea, Ill take his advice. 除非你有更好的主意, 否则我将听取他的意见。2. unless用于引出某事发生或成立所必需的条件。例如:You should not promise anything unless you can d
6、o it.除非你能做到, 否则不要随便许诺。,实战演练I. 根据句意, 用if或unless填空。1. _ you put paper into a fire, it burns.2. I wont let you play football _ you finish cleaning your bedroom.3. Well have to stay in the classroom _ it keeps snowing.,If,unless,if,4. _ you work hard, you wont pass the English exam.5. Its easy to rememb
7、er the new words _ you have a good memory.,Unless,if,II. 将下列单词或词组连接成句。6. I, get, wont, abroad, if, dont, go, chance, the, I (.)_7. go, she, every, no, she, shopping, day, will, money, unless, has (.)_,I wont go abroad if I dont get the chance.,She will go shopping every day unless she has no money.,
8、8. a, it, candle, you, burns, light, if (,) (.)_9. my, me, the, surf, I, mother, my, finish, Internet, wont, homework, let, unless (.)_10. bus, we, if, a, take, it, be, will, cheaper(.)_,It will be cheaper if we take a bus.,If you light a candle, it burns.,My mother won t let me surf the Internet un
9、less I finish my homework.,III. 用括号中的词或结构将下列句子转换为同义句。11. I wont go to sleep if I dont finish my homework. (unless)_12. Unless you receive the invitation, you cant go to the meeting. (if .not)_,If you dont receive the invitation, you cant go to the meeting.,I wont go to sleep unless I finish my homew
10、ork.,13. If you cant remember the passage, you must read it again and again. (unless)_14. You wont live here unless you have enough money. (if .not)_,You wont live here if you don t have enough money.,Unless you can remember the passage, you must read it again and again.,15. If you dont finish your
11、work, the boss wont let you go. (unless)_16. He wont stop playing computer games unless he is tired. (if .not)_,He wont stop playing computer games if he is not tired.,Unless you finish your work, the boss wont let you go.,IV. 单项选择17. Playing with these kids is necessary _ you want to make friends w
12、ith them.A. ifB. until C. unless D. though,18. Kitty will spend more time with her children if she _ a mother. A. becomesB. become C. became D. becoming19. Mary often walks the dog in the afternoon _ bad weather stops her. A. when B. unless C. because D. since,20. _ you ring Tony, he wont know about
13、 the party on Friday. A. If B. When C. Unless D. However21. If you drop a mirror(镜子), it _. A. breaking B. break C. broke D. breaks,短语收藏夹 Phrase collectionUnit 7短语聚会1. take out (从银行账户中) 提取 (款)2. pour out of 从中涌出3. stay relaxed 保持放松4. switch off 关掉5. turn into 变成6. put.into. 把放进里面7. get a toothache 牙
14、疼,8. a balanced diet 均衡的饮食9. slow down (使)放慢速度; 松劲10. in the middle of 在中间11. at the beginning 开始12. make a funny noise 发出奇怪的声音13. exercise ones brain 锻炼某人的头脑14. live a healthy life 过着健康的生活,【操练场】 根据句意从上面选择适当的短语并用其正确形式填空, 补全句子。1. _, I didnt know him, but later we became good friends.2. _ the lights w
15、hen you leave the classroom.3. Mrs Green _ a lot of money from the bank just now.,At the beginning,Switch off,took out,4. If you _, you shouldnt eat sweet food.5. People _ the building after it caught fire.6. _ when you take an exam.7. If you feel tired when you are running, you can _.,get a toothac
16、he,poured out of,Stay relaxed,slow down,8. The tall man standing _ the crowd seems upset.9. When the water boils, _ the rice _ the boiled water.,into,in the middle of,put,For Unit 7Section A (For Grammar)I. 连接下面分句, 组成条件句。( ) 1. If bears feel in danger, ( ) 2. You get four ( ) 3. If you pour oil in w
17、ater, ( ) 4. You will miss the train ( ) 5. If you go out in the rain,e,d,c,g,a,( ) 6. Unless you study hard, ( ) 7. It turns into water ( ) 8. She will keep on singing ( ) 9. We will go on a picnic( ) 10. Unless I visit every bookstore in the town,f,b,j,h,i,a. you get wet.b. if you heat ice.c. it f
18、loats.d. if you divide eight by two.e. they attack people.f. you wont pass the examination.g. if you dont hurry up.h. if it doesnt rain tomorrow.i. I shall not know whether I can get what I want.j. unless she is told to stop.,II. 用括号中动词的正确时态完成条件句。11. If there _ (be) a lot of traffic, our journey _ (
19、take) a longer time.12. If you _ (sleep) badly at night, you often _ (feel) tired the next day.13. Our brains _ (work) better if we _ (be) healthy.,is,takes,sleep,feel,work,are,14. Unless you _ (return) the books to the library, you _ able to borrow more books.15. Your dad _ (let) you go out to play
20、 unless you _ (tidy) up your bedroom.,tidy,return,won t be,wont let,III. 根据句意, 选用if或unless连接句子。16. Fish die. There is no water._17. My baby sister never cries. She is hungry._,My baby sister never cries unless she is hungry.,If there is no water, fish die.,18. I run every morning. Bad weather stops
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