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参考答案
一、用所给动词的适当形式填空
1. rains; will cancel
2. will miss; get
3. finish
4. Tell; know
5. has
6. don’t study
7. will help; am
8. take; is
9. comes; will bring
10. won’t go; blows
11. Be; enter
12. allows; will visit
13. will make; is
14. save; will protect
15. return
二、单项选择
1. B 2.A 3. B 4. B 5.A 6. C 7.A 8. B 9. B 10.A 11. C 12. B 13.A 14. C 15.A
三、句型转换
1. Go to the Great Wall if you visit Beijing.
2. I will call you if I arrive at the station.
3. He failed the exam because he didn’t review his lessons.
4. Since everyone knows the rule, we don’t need to explain it again.
5. Hurry up, or you’ll be late for school.
四、句子翻译
1. If you want to know more about the city, visit the museum.
2. If it is sunny tomorrow, we’ll go climbing.
3. Since everyone is ready, let’s set off.
4. I couldn’t go to the cinema yesterday because I had to do my homework at home.
5. She may have dinner with us if she arrives in time.
五、短文填空
1. If
2. because
3. Since
4. because
5. If2026学年外研版九年级上册英语（新教材）
Unit 1 Teenagers today 原因状语从句和条件状语从句精讲精练
1. 条件状语从句
我们首先学习用来表达建议的“if从句 + 祈使句”结构，相当于汉语的“如果……，就……吧”。我们来看几个例句：
If you want to know more about it, call now. 如果你想了解更多情况，现在就打电话吧。
If you want to know what to see, look at the guide. 如果你想知道有什么可看的，就读一下指南吧。
If you do not feel well, please go to see the doctor. 如果你感觉不舒服，就请去看医生吧。
从例句中可以看出，if引导的条件状语从句不是指已经发生的事件，而是指能够发生或可能发生的事件。
if引导的从句可以放在主句之前，也可以放在主句之后。例如：
If you ever go to London, make sure you visit the Science Museum.
如果你去伦敦，一定要去参观科学博物馆。
这个句子可以改写为：
Make sure you visit the Science Museum if you ever go to London.
下面我们继续学习if引导的条件状语从句。我们先来看以下例句：
If it rains, we’ll stay at home.
如果下雨，我们就待在家里。
If you start doing your homework now, you’ll finish it before dinner.
如果你现在开始做家庭作业，晚饭前就可以做完了。
If you do all these other things instead of your homework, you won’t have time to study.
如果你尽做这些其他的事，不做作业，你就没有时间学习了。
从例句中我们可以看出，if引导的从句表示某种假设的情况，主句则表示此种情况所导致的结果。一般来说，这种结构中的从句如果用一般现在时，那么主句的谓语多用一般将来时或“情态动词 + 动词原形”。我们再来看两个例句：
If I start doing my homework after dinner, I’ll finish it before I go to bed.
如果我晚饭后开始做家庭作业，睡觉前就能做完。
She may come with us if she arrives in time.
如果她来得及时，就可以和我们一道去。
2. 原因状语从句
如果从句表示的是主句行为的原因，就构成原因状语从句。原因状语从句由表示原因的连词引导，常用的是because。例如：
Mark couldn’t come because he had to work.
Mark来不了，因为他得工作。
I couldn’t phone you because I didn’t have your number.
我无法给你打电话，因为我没有你的电话号码。
since也可以用来引导原因状语从句，表示显然的或已为人所知的理由，常译为“因为；既然”。Since everyone is here, let’s start.
既然大家都到齐了，我们就开始吧。
综合练习题（条件状语从句+原因状语从句）
一、用所给动词的适当形式填空。
1. If it ________ (rain) tomorrow, we ________ (cancel) the sports meeting.
2. You ________ (miss) the early bus if you ________ (get) up late tomorrow morning.
3. If you ________ (finish) your homework early, you can watch TV for an hour.
4. ________ (tell) me the truth if you ________ (know) what happened.
5. She may join our trip if she ________ (have) free time this weekend.
6. If you ________ (not study) hard, you won’t get good grades.
7. I ________ (help) you with your English if I ________ (be) free this evening.
8. Make sure you ________ (take) your umbrella if it ________ (be) cloudy.
9. If Tom ________ (come) to the party, he ________ (bring) some delicious snacks.
10. We ________ (not go) swimming if the wind ________ (blow) strongly this afternoon.
11. ________ (be) quiet if you ________ (enter) the reading room.
12. If your mother ________ (allow) you, you ________ (visit) your grandma this Sunday.
13. Anyone ________ (make) mistakes if he ________ (be) too careless.
14. If we ________ (save) water every day, we ________ (protect) our living environment better.
15. You may borrow my dictionary if you ________ (return) it before Friday.
二、单项选择。
( )1. —Why didn’t Tom join us for the picnic
—He stayed at home ________ he had to look after his little sister.
A. if B. because C. since
( )2. ________ you finish your report, please send it to me at once.
A. If B. Because C. Since
( )3. ________ all the students are ready, we can begin our class now.
A. If B. Since C. Because
( )4. If you ________ harder, you ________ much better progress next term.
A. work; make B. work; will make C. will work; make
( )5. You ________ enter the library if you ________ your student ID card.
A. can’t; don’t take B. won’t; won’t take C. can; didn’t take
( )6. I didn’t reply to your message ________ my phone was broken yesterday.
A. if B. since C. because
( )7. —Can Lily go shopping with us
—She ________ go with us if she ________ her housework before 3 p.m.
A. may; finishes B. will; finish C. can; will finish
( )8. ________ you ever visit Paris, don’t forget to take photos of the Eiffel Tower.
A. Because B. If C. Since
( )9. We have to walk home ________ there is no bus left at this time.
A. if B. because C. since
( )10. ________ you have nothing important to do, why not come to watch a movie with me
A. Since B. If C. Because
( )11. If it ________ fine tomorrow, we ________ fly kites in the park.
A. is; will B. will be; will C. is; will fly
( )12. He failed the math test ________ he seldom reviewed his lessons.
A. if B. because C. since
( )13. You ________ feel much better if you ________ a good rest tonight.
A. will; have B. will; will have C. can; will have
( )14. ________ you meet difficulties in study, you can ask your teachers for help.
A. Because B. Since C. If
( )15. Since it is too late, we ________ stay at home instead of going out.
A. can B. can’t C. won’t
三、句型转换（改写if从句位置、合并原因从句）
1. If you visit Beijing, go to the Great Wall.（改为主句在前，从句在后）
________________________________________________________
2. I will call you. I arrive at the station.（用if合并为一句）
________________________________________________________
3. He failed the exam. He didn’t review his lessons.（用because合并）
________________________________________________________
4. Everyone knows the rule. We don’t need to explain it again.（用since合并）
________________________________________________________
5. If you don’t hurry, you’ll be late for school.（改为祈使句开头）
________________________________________________________
四、句子翻译。
1. 如果你想了解这座城市，就去参观博物馆吧。
________________________________________________________
2. 如果明天天气晴朗，我们就去爬山。
________________________________________________________
3. 既然所有人都准备好了，我们就出发吧。
________________________________________________________
4. 我昨天没能去看电影，因为我必须在家做作业。
________________________________________________________
5. 如果她能准时到达，她或许可以和我们一起吃晚饭。
________________________________________________________
五、阅读短文，用if, because, since填空，每词可多次使用
My plan for this weekend
I want to go hiking with my friends this Saturday.
1. ______ it rains on Saturday morning, we will put off the plan to Sunday.
2. We will leave early 7 a.m. ______ we want to avoid the heavy traffic.
3. ______ all of us have finished our homework, our parents will allow us to go out.
4. We will take plenty of water ______ we may feel thirsty on the mountain.
5. ______ you come with us, remember to wear comfortable sports shoes.

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