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2025 秋人教英语八上 单元语法
Unit 8 Let's Communicate!
if 引导的条件状语从句
一、定义
if引导的条件状语从句，是表示主句动作发生所需条件的从句。在 Unit 8中，主
要用于讨论在不同沟通情境下可能出现的情况以及相应的结果，通过这种语法结构，
能清晰地表达条件与结果之间的逻辑关系。
二、构成形式
1.基本结构：if 引导的条件状语从句由 “if + 从句，主句” 构成。例如：If you want to
solve the problem, a face-to-face talk usually works the best.（如果你想解
决问题，面对面交谈通常是最好的方式。）其中，“If you want to solve
the problem”是条件状语从句，“a face-to-face talk usually works the best”
是主句。
2.时态搭配（主将从现原则）：在 if引导的条件状语从句中，当主句描述将来
的情况时，主句用一般将来时（will + 动词原形），从句用一般现在时
表示将来。例如：If it doesn't rain tomorrow, we will go for a picnic.（如
果明天不下雨，我们就去野餐。）“If it doesn't rain tomorrow”是从句，
用一般现在时；“we will go for a picnic”是主句，用一般将来时。
3.特殊情况：当主句是祈使句或含有情态动词（如 can, may, must等）时，从句仍然
用一般现在时。例如：If you need help, call me.（如果你需要帮助，打
电话给我。）主句是祈使句，从句用一般现在时；If you can finish your
work early today, you can go home.（如果你今天能早点完成工作，你就
可以回家。）主句含有情态动词 can，从句用一般现在时。
三、用法
1.表达假设情况及结果：在讨论沟通场景时，常通过 if引导的条件状语从句假设
某种沟通情境，进而阐述在这种情境下会产生的结果。如 Texting
can make things worse if you're not careful with your words.（如果
你在发信息时不注意言辞，可能会让事情变得更糟。）假设了发
信息时不注意言辞这个条件，得出事情会变糟的结果。
2.提出建议和可能性：可以用来提出在特定条件下的建议或说明可能的情况。例如：
If you can't meet, just call your friend.（如果你不能见面，就给你的
朋友打电话。）提出了不能见面这个条件下的建议。
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2025 秋人教英语八上 单元语法
3.表示因果关系：在一定程度上体现条件与结果之间的因果联系。如 If we can have
a face-to-face meeting, I think we'll understand each other better.
（如果我们能进行面对面的交流，我想我们会更好地理解彼此。）
“面对面交流”是条件，“更好地理解彼此”是结果，两者存在因果
关系。
四、注意事项
1.if 从句位置：if 引导的条件状语从句可以放在主句前，也可以放在主句后。当 if从
句在主句前时，从句后要用逗号与主句隔开；当 if从句在主句后时，不
用逗号隔开。例如：If you stay calm and say sorry, it will help. = It will help
if you stay calm and say sorry.（如果你保持冷静并道歉，这会有帮助。）
2.与其他引导词引导的状语从句区别：if引导的条件状语从句与 when引导的
时间状语从句在用法上有相似之处，但 when强调时间点或时间段，而
if 强调条件。例如：When I grow up, I will be a teacher.（当我长大后，
我会成为一名教师。）强调时间； If I study hard, I will pass the exam.
（如果我努力学习，我会通过考试。）强调条件。
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Unit 8 Let's Communicate!
if 引导的条件状语从句
巩固练习
一、单项选择
1. If it ______ tomorrow, we ______ to the park.
A. doesn't rain; will go B. won't rain; go C. doesn't rain; go
2. You'll be late for school ______ you don't get up early.
A. if B. when C. before
3. If you ______ to the party, you'll have a great time.
A. go B. will go C. goes
4. I'll call you if he ______ back.
A. come B. comes C. will come
5. If you ______ careful with your words, texting can be a good way to
communicate.
A. are B. will be C. were
6. If she ______ this dress, she ______ look more beautiful.
A. wears; will B. will wear; will C. wears; is going to
7. We ______ have a picnic if the weather ______ fine.
A. will; is B. will; will be C. are going to; will be
8. If you ______ me, I'll give you some advice.
A. will listen to B. listen to C. listened to
9. The students will go to the zoo if it ______ tomorrow.
A. won't rain B. doesn't rain C. not rain
10. If you want to make more friends, you ______ be more outgoing.
A. should B. will C. are going to
二、用所给单词的适当形式填空
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2025 秋人教英语八上 单元语法
1. If it ______ (be) sunny tomorrow, we ______ (go) hiking.
2. She ______ (call) you if she ______ (have) time.
3. If you ______ (not study) hard, you ______ (not pass) the exam.
4. They ______ (visit) the museum if they ______ (have) free time.
5. If you ______ (help) others, others ______ (help) you.
6. He ______ (be) happy if you ______ (give) him a present.
7. If it ______ (rain) tomorrow, we ______ (stay) at home.
8. We ______ (go) to the movies if we ______ (finish) our homework early.
9. If she ______ (not come) to the party, we ______ (be) very disappointed.
10. You ______ (get) good grades if you ______ (work) hard.
三、按要求完成句子
1. If you study hard, you'll pass the exam.（改为否定句）
______ you ______ study hard, you ______ pass the exam.
2. We'll go for a picnic if it's sunny tomorrow.（对划线部分提问）
______ ______ you ______ if it's sunny tomorrow
3. If he comes, I'll tell him the news.（改为一般疑问句）
______ you ______ him the news if he ______
4. They will visit the Great Wall if they come to Beijing.（用 be going to改写句子）
They ______ ______ ______ visit the Great Wall if they come to Beijing.
5. If you don't hurry, you'll be late.（改为同义句）
______ hurry, ______ you'll be late.
四、阅读理解
阅读短文，根据短文内容选择正确答案。
If you want to make friends, what should you do
Steps:
★Try to look on the bright side of things.
★Look for groups in your area that do something you are interested in. Maybe
you will learn some new skills and meet some people who have many things in
common with you.
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2025 秋人教英语八上 单元语法
★Contact your friends at least once a week by telephone or e-mail, or by visiting
them to find out how they are. Remember important things about them, like
birthdays and weddings.
★If you have an argument with your friends, say sorry first.
★Remember never to leave old friends just because you have made some new
ones.
★Listen to others carefully. It's better to be a good listener.
★Be different. Don't try to change others through your own ideas.
Warnings:
★Never ask or give away（泄露）a friend's secret.
★Don't be afraid to stand up for what is right.
★You'd better not give your ID number, phone number or your home address to
people that you have just made friends with.
1.（ ）Why is it good to look for groups in your area
A. Because it isn't far. B. Because it is a rule in your area.
C. Because you can make some friends with the same interests.
2.（ ）The underlined word “Contact” means “______” in Chinese.
A.联系 B.关系 C.关联
3.（ ）If you are somebody's good friend, you should ______.
①try to know his or her secrets
②support him or her when he or she is right
③keep in touch with him or her often
④try to change him or her with your own ideas
A.①② B.②③ C.②④
4.（ ）Which of the following is NOT right according to the passage
A. Listen to your friends carefully and keep their secrets.
B. To keep in touch with your new friends, you'd better tell them your phone
number.
C. If you have an argument with your good friend, you'd better say sorry to him or
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2025 秋人教英语八上 单元语法
her first.
5.（ ）What's the best title for the passage
A. What Is Real Friendship B. Where to Meet New Friends
C. How to Make Friends
五、写作
以 “If I Have a Lot of Money” 为题，写一篇短文。要求：使用 if 引导的条件
状语从句，描述你有钱之后的计划和行动，80词左右。
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2025 秋人教英语八上 单元语法
答案
一、单项选择
1. A。在 if引导的条件状语从句中，遵循 “主将从现”原则，即主句用一般将来时（will +动词原形），
从句用一般现在时。从句主语 it是第三人称单数，否定借助 doesn't，动词用原形 rain；主句用 will
go，所以选 A。
2. A。“if”表示 “如果”，引导条件状语从句；“when”表示 “当……时候”，引导时间状语从句；“before”
表示 “在……之前”，引导时间状语从句。这里表达 “如果你不早起，你上学将会迟到”，是条件关系，
用 if，选 A。
3. A。同样遵循 “主将从现”原则，if从句用一般现在时，主语是 you，动词用原形 go，选 A。
4. B。“if”从句中，主语 he是第三人称单数，动词用第三人称单数形式 comes，选 B。
5. A。从句用一般现在时，主语是 you，be动词用 are，选 A。
6. A。“if” 从句用一般现在时，主语 she 是第三人称单数，动词 wear 用第三人称单数形式 wears；主
句用一般将来时 will +动词原形，选 A。
7. A。主句用一般将来时 will +动词原形，从句用一般现在时，主语 the weather 是第三人称单数，be
动词用 is，选 A。
8. B。“if”从句用一般现在时，主语是 you，动词用原形 listen to，选 B。
9. B。“if”从句用一般现在时，主语 it是第三人称单数，否定借助 doesn't，动词用原形 rain，选 B。
10. A。“should”表示 “应该”，这里表达 “如果你想交更多的朋友，你应该更外向”，选 A。
二、用所给单词的适当形式填空
1. is; will go。“if”从句用一般现在时，主语 it是第三人称单数，be动词用 is；主句用一般将来时 will +
动词原形，所以填 is; will go。
2. will call; has。“if” 从句用一般现在时，主语 she 是第三人称单数，动词 have 用第三人称单数形式
has；主句用一般将来时 will +动词原形，所以填 will call; has。
3. don't study; won't pass。“if”从句用一般现在时，主语是 you，否定借助 don't，动词用原形 study；
主句用一般将来时 will +动词原形的否定形式 won't +动词原形，所以填 don't study; won't pass。
4. will visit; have。“if” 从句用一般现在时，主语 they 是复数，动词用原形 have；主句用一般将来时
will +动词原形，所以填 will visit; have。
5. help; will help。“if”从句用一般现在时，主语是 you，动词用原形 help；主句用一般将来时 will +动
词原形，所以填 help; will help。
6. will be; give。“if”从句用一般现在时，主语是 you，动词用原形 give；主句用一般将来时 will + 动词
原形，所以填 will be; give。
7. rains; will stay。“if” 从句用一般现在时，主语 it 是第三人称单数，动词 rain 用第三人称单数形式
rains；主句用一般将来时 will +动词原形，所以填 rains; will stay。
8. will go; finish。“if” 从句用一般现在时，主语是 we，动词用原形 finish；主句用一般将来时 will + 动
词原形，所以填 will go; finish。
9. doesn't come; will be。“if”从句用一般现在时，主语 she 是第三人称单数，否定借助 doesn't，动词
用原形 come；主句用一般将来时 will +动词原形，所以填 doesn't come; will be。
10. will get; work。“if” 从句用一般现在时，主语是 you，动词用原形 work；主句用一般将来时 will +动
词原形，所以填 will get; work。
三、按要求完成句子
1. If; don't; won't。“if” 引导的条件状语从句变否定句，从句和主句分别否定。从句主语是 you，否定
借助 don't；主句用 will的否定形式 won't，所以填 If; don't; won't。
2. What will; do。对 “go for a picnic”提问，用 what，后接一般将来时的一般疑问句，把 will 提前，所
以填What will; do。
3. Will; tell; comes。“if”引导的条件状语从句变一般疑问句，把主句的 will提前，从句用一般现在时，
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2025 秋人教英语八上 单元语法
主语 he是第三人称单数，动词 come用第三人称单数形式 comes，所以填Will; tell; comes。
4. are going to。“will” 和 “be going to” 都可表示将来，原句主语是 They，be 动词用 are，所以填 are
going to。
5. Hurry; or。“If you don't hurry, you'll be late.” 的同义句可以用 “祈使句 + or + 陈述句”，所以填 Hurry;
or。
四、阅读理解
1. C。根据 “Look for groups in your area that do something you are interested in. Maybe you will learn
some new skills and meet some people who have many things in common with you.” 可知，在当地找相
关团体可以结交有共同兴趣的朋友，选 C。
2. A。根据 “Contact your friends at least once a week by telephone or e-mail, or by visiting them to find
out how they are.”可知，这里说的是通过电话、邮件或拜访朋友来了解他们的情况，所以 “Contact”
是 “联系”的意思，选 A。
3. B。根据 “Never ask or give away a friend's secret.” 可知①错误；根据 “Don't be afraid to stand up for
what is right.”可知要支持朋友正确的事，②正确；根据 “Contact your friends at least once a week by
telephone or e-mail, or by visiting them to find out how they are.” 可知要经常和朋友保持联系，③正
确；根据 “Don't try to change others through your own ideas.”可知④错误。所以选 B。
4. B。根据 “You'd better not give your ID number, phone number or your home address to people that you
have just made friends with.”可知，刚结交的朋友最好不要告诉他们你的电话号码，B选项错误，选
B。
5. C。文章主要介绍了交朋友的步骤和注意事项，即如何交朋友，选 C。
五、写作
If I Have a Lot of Money
If I have a lot of money, I will do many meaningful things. If I have enough money, I will buy a big house for
my parents. They have worked hard for me, and I want them to live a comfortable life.
If I am rich, I will also help the poor. I will donate some money to the charities so that more children can go
to school and have a better future.
In addition, if I have a lot of money, I will travel around the world. I can learn different cultures and make
more friends. I believe my life will be more colorful if I have a lot of money.
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