{if条件状语从句}
一.If引导的条件状语从句的定义
条件状语从句在复合句中作条件状语,表示假如有从句的动作发生或从句的状态存在,就会导致主句的动作发生或状态存在。条件状语从句常由连词if引导。
二.If引导的条件状语从句的句式结构
if引导的从句用于表示条件,主句用于表示结果。
例句:If it doesn't rain, I will go to the cinema tomorrow.
从句 主句
三.If引导的条件状语从句中的时态
主将从现:
当主句的动作或状态表示可能的结果时,主句的谓语动词用一般将来时,if引导的条件状语从句的谓语动词用一般现在时,即“主将从现”。如:
If it rains this afternoon, we’ll stay at home. 如果今天下午下雨,我们将待在家里。
②.if引导的条件状语从句可置于主句的前面或主句的后面。置于主句的前面时,须用逗号与主句隔开;置于主句的后面时,则不须用逗号。如:
If I am free this weekend, I will go to the bookstore.
= I will go to the bookstore if I am free this weekend.
如果这周末有空,我会去那家书店。
2.主情从现:主句的谓语部分可根据句子的实际情况用其他情态动词替换will。如:
She may feel sad if you don’t come. 如果你不来,她可能会伤心。
3主祈从现:if引导的条件状语从句,主句可以是一个祈使句,从句:用一般现在时。
Don’t wait for me if I’m late .
【拓展】
4.主现从现:当主句的动作表示真理或必然的结果时,主句和if引导的条件状语从句的谓语动词都用一般现在时。如:
If we heat ice, it turns into water. 如果我们把冰加热,它就会化成水。
If you drop the glass on the floor, it breaks. 如果你把这玻璃杯摔落到地上,它会碎掉。
【典例分析】
1.If you ________ going shopping, you can go to Hong Kong.
A.likes B.will like C.like D.liked
If you want to visit the Palace Museum, I ________ tickets for you tomorrow.
A.buy B.buying C.will buy D.buys
{课堂练习}
一、单项选择
1.If you ________ careful, you ________ many mistakes.
A.don’t be; will make B.will not be; make
C.aren’t; will make D.will not be; will make
2.—Would you like to climb the mountain with us this weekend
—Sure, I’ll go __________ I’m free.
A.and B.if C.because D.or
3.________ you work hard on your study, your dreams will come true.
A.If B.Because C.So D.Or
4.— Mum, can I help you clean the house
— Of course, ________ you would like to.
A.because B.but C.or D.if
5.You should(应该)see a doctor, ________ you don’t feel well.
A.if B.and C.after D.before
6.—I hear Jackie Chan will come to Wuxi next week.
—Really ________ he ________, my sister will be very happy.
A.If; comes B.If; will come C.Before; come
7.The meat will go bad easily ________ you don’t put it in the fridge (冰箱).
A.because B.if C.but
8.If it ________ tomorrow, we will go on a picnic by the lake.
A.isn’t raining B.won’t rain C.rained D.doesn’t rain
9.We’ll stay at home ________ it rains.
A.before B.after C.if D.when
10.—What are you going to do this afternoon
—I will play basketball if it _________.
A.isn’t rain B.rains C.won’t rain D.doesn’t rain
二、用所给单词的正确形式填空(本大题共10小题,每小题2分,共20分)
1.If it _________ (not rain), we will go out for a trip.
2.The students ________ (go) to the Summer Palace if they don’t have a test.
3.You ______ (get) wet if you stand in the rain without an umbrella.
4.The picnic will be canceled if it ______ (rain) tomorrow.
5.If I ________ (have) time, I will join you.
6.If there is a fire, I ________ (call) 119 for help.
7.What ________ (happen) if they have the party tomorrow
三、阅读理解
One evening Mr. Green is driving his car in the country and looking for a small hotel(旅馆). When he sees an old man on the side of the road, Mr. Green stops his car and says to the old man, “I want to go to the Sun Hotel. Do you know how to get there ”
“Yes, of course,” the old man answers, “I will show you the way. Please let me sit in your car. I can go with you and tell you where to turn.”
He gets in Mr. Green’s car. They drive about twelve miles(英里). When they come to a small house, the old man says, “Stop here.” Mr. Green stops his car and says, “But this isn’t a hotel.”
“No,” the old man answers. “This is my house. Thank you very much for driving me home. And I’ll show you the way to the Sun Hotel. Turn around and go back nine miles. Then you will get to the hotel.”
31. What is Mr. Green doing
A. He is mending his car. B. He is driving his car and looking for a hotel
C. He is looking for his car. D. He is looking for a horse.
32. Mr. Green asks ______ how to get to the Sun Hotel.
A. a young man B. a woman C. a child D. an old man
33. What does the old man ask Mr. Green to let him do first
A. The old man asks Mr. Green to let him sit in his car.
B. The old man shows the way to the post office.
C. The old man shows Mr. Green the way to the Sun Hotel.
D. The old man tells Mr. Green to turn right at the first crossing.
34. How far does Mr. Green drive when he comes to the Sun Hotel at last
A. 3 miles. B. 12 miles. C. 21 miles. D. 9 miles.
35. How does Mr. Green feel after he hears the old man’s words
A. Angry(生气的). B. Hungry. C. Sad. D. Glad.