_unit 7 memory 语法 if条件状语从句牛津深圳版英语八年级上册

八上Unit 7 Memory 语法(If条件状语从句)
【学习目标】
1.掌握unit 7 语法if引导的条件状语从句的概念，构成及应用
【课前小测】
一、单项选择。

1. Our business won’t improve ____ we offer better service to our customers.
A. because
B. unless
C. after
D. since
2.—Let’s go climbing if it_________ this Saturday.
—Good idea. But nobody knows if it _____ .
A. is fine; rains
B. is fine; will rain
C. will be fine; rains
D. will be fine; will rain
3. If you take the fish out the water, it ________.
A. dies
B. will die
C. died
D. is dying
4.If you _____ to join an educational exchange, you must apply for it first.
A. want
B. wanted
C. wants
D. wanting
5 .In hot weather, food goes bad easily ______ it is kept in the fridge.
A. because
B. if
C. unless
D. since
6. —May I play the computer game?
—No, _____ you promise to finish your homework first.
A. unless
B. if
C. but
D. so
7. They ____ the Great Wall unless it_______ .
A. will visit; will rain
B. will visit; rains
C. visit; will rain
D. visit; rains
8. If I find your dog, I _____ you a call.
A. give
B. gave
C. giving
D. will give
9. I ________ her the answer if she ________ now.
A. can tell; will ask
B. will tell; will ask
C. would tell; asks
D. will tell; asks
10. You _________ a toothache unless you _________ your teeth every day.
A. will get; brush
B. will get; will brush
C. get; will brush
D. get; brush
二、用括号内所给词的适当形式填空。

1. If he _________ (come) tonight, he will meet you at the party.
2. If the weather_________ (get) worse, we will have to stay inside.
3. If the rain__________ (stop) soon, will you go to the cinema with me?
4. I ________ (buy) a new mobile phone if I ________ (have) enough money.
5. If you ________ (drop) a glass, it____________ (break).
答案：一.1-5 BBBAC 6-10 ABDDA
二es 2. Gets 3.will stop 4. will buy have 5.drops will break
【要点梳理】
一、由if引导的条件状语从句
1.主现从现--谈论客观真理、客观事实和普遍现象时，表示条件的从句用一般现在时，用if 引导;表示结果的主句用一般现在时，这种句型简称为主现从现句型。

特别注意：从句主语是三单时，谓语动词要加s或es
例如：If spring comes, trees turn green.
If you heat metal, it melts.
2.主将从现--谈论将来可能出现的情况时，表示条件的从句用一般现在时，用if 引导; 表示结果的主句用一般将来时，这种句型简称为主将从现句型。

例如：If I am free tomorrow afternoon（从句）, I will go shopping（主句）.
If you don’t hurry up，you will be late for work.
3.主情从现--谈论将来可能出现的情况时，主句也可用情态动词，从句用一般现在时。

例如：If it stops snowing, we can go out.
If you want to lose weight, you must/should eat less bread.
4.主祈从现--谈论将来可能出现的情况时，主句也可用祈使句，表示提醒告诫，从句用一般现在时。

例如：If you want to go, please tell me.
If you like the photo, put it on the wall.
提示：
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隔开。

例如：If you study hard, you will improve your English.
You will improve your English if you study hard.
2. 有时，if引导的条件状语从句可以进行转换，
肯定句转换为：祈使句，and +简单句(将来时)，
If you study hard, you will get good grades. = Study hard, and you will get good grades.
否定句转换为：祈使句，or+简单句(将来时)。

or表示“否则”
If you don’t hurry up, you will be late. = Hurry up, or you will be late.
二、unless 意为“除非”，和if…not (如果……不……)的意思相近，可以互换使用。

在unless引导的从句中，通常用一般现在时，主句用一般将来时，即“主将从现”。

例如：We will have a picnic tomorrow if it does not rain.
= We will have a picnic tomorrow unless it rains.
三、as /so long as引导的条件状语从句as /so long as意思是“只要”
So long as you're happy,I will be happy. 只要你高兴，我就高兴。

As long as you have a balanced diet, you can keep healthy.
只要你平衡饮食，你就能保持健康
四、once引导的条件状语从句
once引导的条件状语从句，意为“一旦...，就”，从句可置于主句前或后Once you begin,never stop.一旦开始，就绝不要停止。

Maths is easy to learn once you understand the rules.
一旦你理解了规则，数学就不难学了。

补充：
1.连接词：if; unless; in case, as long as; so long as; on condition that (=as long as);
suppose/ supposing (=if ); provided (=if) ; but for 要不是without 如果没有in case of sth.万一；以防
2. 例句
1. I'll tell you the truth on condition that you promise to keep it a secret.
2. But for your help, we shouldn't have finished it in time.
3. Supposing it rains, shall we continue the sports meeting?
4. In case I forget, I prepare a note to remind me of the things.
5. We will sign the contract provided the prize they offer is right.
【总结】
【课堂练习】
一.根据所给的汉语内容，用英语完成下列句子。

每空一词，缩写算一词。

1. 如果你长时间不浇花，它们就会死。

Flowers ___________ if you ___________ ___________ them for a long time.
2. 如果明天下雨，我就呆在家里。

If it___________ tomorrow, I___________ ___________ at home.
3 如果这只狗吃太多的肉，它会很饱。

If the dog eats too much meat, it___________ ___________.
4. Ben，如果你早早完成作业，你就可以回家了。

Ben, you can go home if you___________ your homework ___________.
5. 如果我妈妈参观中国的话，她将会给我买一件礼物。

My mother___________ ___________ me a gift if she ___________ China. 二．用括号中所给单词的正确形式填空。

1. Jane _________ (feel) better if she takes medicine.
2. Call me if the train _____________ (not arrive) at 3:30 pm.
3. Mandy ________ (lose) the tennis game unless she _________ (practise) a lot.
4. You can _________(visit) our website if you want to know more information about it.
5. If we try our best, our dreams _________ (come) true one day.
6 Mr Wang _________ (do) sports every morning unless bad weather _________ (stop) him.
7. If you take a taxi, you _________(get) there before 9 o’clock.
8. She will not remember the facts unless she ___________(understand) them well.
9. You should ask someone for help if you _________(be) in trouble.
10 Linda __________ (not go) to John’s party unless he _________(invite) her.
三. 单项选择
( ) 1. Studying in groups is necessary___________ you want to do well in schoo1.
A. if
B. until
C. unless
D. though ( ) 2. Kevin will give less homework to his students if he ___________ a teacher.
A. becomes
B. become
C. became
D. becoming ( )3. If our government _____ pay attention to the safety of food, our health _____ in danger.
A. isn't; is
B. doesn't; will be
C. won't; is
D. isn't; will be ( )4. —Your aunt often walks the dog in the morning.
—Yeah, ___________ bad weather stops her.
A. when
B. unless
C. because
D. since ( )5. If a polar bear ___________, it ___________ fish from the water.
A. will be hungry; catches
B. is hungry; will catch
C. is going to be hungry; catches
D. is hungry; won't catch
( )6. —Can students go online during lessons?
—They can ____ it is for that lesson.
A. if
B. or
C. so
D. but
( ) 7. —I think Karen should go swimming with Kate.
—If she ____, she will have great fun.
A. does
B. do
C. will do
( )8. When you are in your school dining hall during lunchtime, you may feel
lonely ____you can find someone to have lunch with.
A. if
B. unless
C. after
D. because
( ) 9. —Do you think if Robert will go to the zoo tomorrow?
—I think he will go if he ____ too much homework.
A. don’t have
B. won’t have
C. doesn’t have
( )10. You mustn’t drive a car on the road ____ you get a driver’s license.
A. unless
B. if
C. since
答案一.1. die; don’t water 2. rains; will stay 3. is full 4. finish; early
5. will buy; visits
二．1.will feel 2.doesn’t arrive 3.will lose; practises 4.visit 5.will come
6.does; stops
7.will get
8.understands
9.are 10.won’t go; invites
三.1-5 AABBB 6-10AABCA
课后作业】
一、语法填空。

Do you have such experiences? When you are introducing someone to the listeners, suddenly you can't come up 1. _______ his name. You can't remember where you've put your valuable things. Most people have. But most of them haven't 2. _______（realize）that they have a memory problem. If you believe memory can be improved, the 3. _______（follow）will show you how.
First, relax. If you keep 4. _______（tell）yourself that your memory is bad, your mind will come to believe it and you won't remember things. But relaxing 5. _______（be）not enough. To improve your memory, you'll need to take 6. _______ active role. Like
your body, you can make your memory strong. Look for 7. ______（chance）to exercise your memory.
If you don't take notice of things8. _______（active）, you won't remember them. So, you can make pictures of what you see in your mind every day. For example, don't just put your keys down! If you want to find 9. _________（they）again, make a mind picture of the place 10. _______ you have put them.
二．完型填空
Some children wish to be writers when they grow up. That 1 that they want to write stories or books. They would be happy if many people read their stories or books some day, but I would like 2 these children that they will need to be good readers and read a lot before they become good writers.
Nearly all great writers often listened 3 others tell stories long before they started school. They also 4 on reading for hours and hours for years. Even when they had become writers, they spent much of their time 5 books instead of watching TV in the evening.
If you are a good reader, it won’t take you long 6 the reading homework your teacher asks you to do. Then you will have time to read 7 books for fun. You will read so 8 that you will always want to look for more books to read.
If you want to be a writer, reading is very 9 . When you decide to become a writer, you had better tell 10 , “I must read more and more if I really want to become a good writer.”
（）1. A. means B. meaning C. mean D. meant
（）2. A. tell B. telling C. told D. to tell
（）3. A. for B. to C. at D. of
（）4. A. keep B. keeping C. kept D. will keep
（）5. A. read B. reads C. reading D. to read
（）6. A. do B. doing C. did D. to do
（）7. A. others B. other C. another D. the other
（）8. A. good B. well C. better D. best
（）9. A. important B. importantly C. importance D.more importantly （）10. A. you B. your C. yourself D. yours
答案：一.1.with 2.realized 3.following 4.telling 5.is 6. an 7.chances 8.actively 9.them
1.where
二.1-5 ADBCC 6-10 DBBAC
11。