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2025 秋人教英語八上 單元語法
Unit 8 Let's Communicate!
if 引導的條件狀語從句
一、定義
if引導的條件狀語從句，是表示主句動作發生所需條件的從句。在 Unit 8中，主
要用于討論在不同溝通情境下可能出現的情況以及相應的結果，通過這種語法結構，
能清晰地表達條件與結果之間的邏輯關系。
二、構成形式
1.基本結構：if 引導的條件狀語從句由 “if + 從句，主句” 構成。例如：If you want to
solve the problem, a face-to-face talk usually works the best.（如果你想解
決問題，面對面交談通常是最好的方式。）其中，“If you want to solve
the problem”是條件狀語從句，“a face-to-face talk usually works the best”
是主句。
2.時態搭配（主將從現原則）：在 if引導的條件狀語從句中，當主句描述將來
的情況時，主句用一般將來時（will + 動詞原形），從句用一般現在時
表示將來。例如：If it doesn't rain tomorrow, we will go for a picnic.（如
果明天不下雨，我們就去野餐。）“If it doesn't rain tomorrow”是從句，
用一般現在時；“we will go for a picnic”是主句，用一般將來時。
3.特殊情況：當主句是祈使句或含有情態動詞（如 can, may, must等）時，從句仍然
用一般現在時。例如：If you need help, call me.（如果你需要幫助，打
電話給我。）主句是祈使句，從句用一般現在時；If you can finish your
work early today, you can go home.（如果你今天能早點完成工作，你就
可以回家。）主句含有情態動詞 can，從句用一般現在時。
三、用法
1.表達假設情況及結果：在討論溝通場景時，常通過 if引導的條件狀語從句假設
某種溝通情境，進而闡述在這種情境下會產生的結果。如 Texting
can make things worse if you're not careful with your words.（如果
你在發信息時不注意言辭，可能會讓事情變得更糟。）假設了發
信息時不注意言辭這個條件，得出事情會變糟的結果。
2.提出建議和可能性：可以用來提出在特定條件下的建議或說明可能的情況。例如：
If you can't meet, just call your friend.（如果你不能見面，就給你的
朋友打電話。）提出了不能見面這個條件下的建議。
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2025 秋人教英語八上 單元語法
3.表示因果關系：在一定程度上體現條件與結果之間的因果聯系。如 If we can have
a face-to-face meeting, I think we'll understand each other better.
（如果我們能進行面對面的交流，我想我們會更好地理解彼此。）
“面對面交流”是條件，“更好地理解彼此”是結果，兩者存在因果
關系。
四、注意事項
1.if 從句位置：if 引導的條件狀語從句可以放在主句前，也可以放在主句后。當 if從
句在主句前時，從句后要用逗號與主句隔開；當 if從句在主句后時，不
用逗號隔開。例如：If you stay calm and say sorry, it will help. = It will help
if you stay calm and say sorry.（如果你保持冷靜并道歉，這會有幫助。）
2.與其他引導詞引導的狀語從句區別：if引導的條件狀語從句與 when引導的
時間狀語從句在用法上有相似之處，但 when強調時間點或時間段，而
if 強調條件。例如：When I grow up, I will be a teacher.（當我長大后，
我會成為一名教師。）強調時間； If I study hard, I will pass the exam.
（如果我努力學習，我會通過考試。）強調條件。
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Unit 8 Let's Communicate!
if 引導的條件狀語從句
鞏固練習
一、單項選擇
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、用所給單詞的適當形式填空
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2025 秋人教英語八上 單元語法
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.（改為否定句）
______ you ______ study hard, you ______ pass the exam.
2. We'll go for a picnic if it's sunny tomorrow.（對劃線部分提問）
______ ______ you ______ if it's sunny tomorrow
3. If he comes, I'll tell him the news.（改為一般疑問句）
______ you ______ him the news if he ______
4. They will visit the Great Wall if they come to Beijing.（用 be going to改寫句子）
They ______ ______ ______ visit the Great Wall if they come to Beijing.
5. If you don't hurry, you'll be late.（改為同義句）
______ hurry, ______ you'll be late.
四、閱讀理解
閱讀短文，根據短文內容選擇正確答案。
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 秋人教英語八上 單元語法
★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.聯系 B.關系 C.關聯
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 秋人教英語八上 單元語法
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、寫作
以 “If I Have a Lot of Money” 為題，寫一篇短文。要求：使用 if 引導的條件
狀語從句，描述你有錢之后的計劃和行動，80詞左右。
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2025 秋人教英語八上 單元語法
答案
一、單項選擇
1. A。在 if引導的條件狀語從句中，遵循 “主將從現”原則，即主句用一般將來時（will +動詞原形），
從句用一般現在時。從句主語 it是第三人稱單數，否定借助 doesn't，動詞用原形 rain；主句用 will
go，所以選 A。
2. A?！癷f”表示 “如果”，引導條件狀語從句；“when”表示 “當……時候”，引導時間狀語從句；“before”
表示 “在……之前”，引導時間狀語從句。這里表達 “如果你不早起，你上學將會遲到”，是條件關系，
用 if，選 A。
3. A。同樣遵循 “主將從現”原則，if從句用一般現在時，主語是 you，動詞用原形 go，選 A。
4. B?！癷f”從句中，主語 he是第三人稱單數，動詞用第三人稱單數形式 comes，選 B。
5. A。從句用一般現在時，主語是 you，be動詞用 are，選 A。
6. A?！癷f” 從句用一般現在時，主語 she 是第三人稱單數，動詞 wear 用第三人稱單數形式 wears；主
句用一般將來時 will +動詞原形，選 A。
7. A。主句用一般將來時 will +動詞原形，從句用一般現在時，主語 the weather 是第三人稱單數，be
動詞用 is，選 A。
8. B?！癷f”從句用一般現在時，主語是 you，動詞用原形 listen to，選 B。
9. B。“if”從句用一般現在時，主語 it是第三人稱單數，否定借助 doesn't，動詞用原形 rain，選 B。
10. A?！皊hould”表示 “應該”，這里表達 “如果你想交更多的朋友，你應該更外向”，選 A。
二、用所給單詞的適當形式填空
1. is; will go?！癷f”從句用一般現在時，主語 it是第三人稱單數，be動詞用 is；主句用一般將來時 will +
動詞原形，所以填 is; will go。
2. will call; has?！癷f” 從句用一般現在時，主語 she 是第三人稱單數，動詞 have 用第三人稱單數形式
has；主句用一般將來時 will +動詞原形，所以填 will call; has。
3. don't study; won't pass?！癷f”從句用一般現在時，主語是 you，否定借助 don't，動詞用原形 study；
主句用一般將來時 will +動詞原形的否定形式 won't +動詞原形，所以填 don't study; won't pass。
4. will visit; have?！癷f” 從句用一般現在時，主語 they 是復數，動詞用原形 have；主句用一般將來時
will +動詞原形，所以填 will visit; have。
5. help; will help。“if”從句用一般現在時，主語是 you，動詞用原形 help；主句用一般將來時 will +動
詞原形，所以填 help; will help。
6. will be; give?！癷f”從句用一般現在時，主語是 you，動詞用原形 give；主句用一般將來時 will + 動詞
原形，所以填 will be; give。
7. rains; will stay。“if” 從句用一般現在時，主語 it 是第三人稱單數，動詞 rain 用第三人稱單數形式
rains；主句用一般將來時 will +動詞原形，所以填 rains; will stay。
8. will go; finish?！癷f” 從句用一般現在時，主語是 we，動詞用原形 finish；主句用一般將來時 will + 動
詞原形，所以填 will go; finish。
9. doesn't come; will be?！癷f”從句用一般現在時，主語 she 是第三人稱單數，否定借助 doesn't，動詞
用原形 come；主句用一般將來時 will +動詞原形，所以填 doesn't come; will be。
10. will get; work?！癷f” 從句用一般現在時，主語是 you，動詞用原形 work；主句用一般將來時 will +動
詞原形，所以填 will get; work。
三、按要求完成句子
1. If; don't; won't。“if” 引導的條件狀語從句變否定句，從句和主句分別否定。從句主語是 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。對 “go for a picnic”提問，用 what，后接一般將來時的一般疑問句，把 will 提前，所
以填What will; do。
3. Will; tell; comes。“if”引導的條件狀語從句變一般疑問句，把主句的 will提前，從句用一般現在時，
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2025 秋人教英語八上 單元語法
主語 he是第三人稱單數，動詞 come用第三人稱單數形式 comes，所以填Will; tell; comes。
4. are going to?！皐ill” 和 “be going to” 都可表示將來，原句主語是 They，be 動詞用 are，所以填 are
going to。
5. Hurry; or。“If you don't hurry, you'll be late.” 的同義句可以用 “祈使句 + or + 陳述句”，所以填 Hurry;
or。
四、閱讀理解
1. C。根據 “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，在當地找相
關團體可以結交有共同興趣的朋友，選 C。
2. A。根據 “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，這里說的是通過電話、郵件或拜訪朋友來了解他們的情況，所以 “Contact”
是 “聯系”的意思，選 A。
3. B。根據 “Never ask or give away a friend's secret.” 可知①錯誤；根據 “Don't be afraid to stand up for
what is right.”可知要支持朋友正確的事，②正確；根據 “Contact your friends at least once a week by
telephone or e-mail, or by visiting them to find out how they are.” 可知要經常和朋友保持聯系，③正
確；根據 “Don't try to change others through your own ideas.”可知④錯誤。所以選 B。
4. B。根據 “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，剛結交的朋友最好不要告訴他們你的電話號碼，B選項錯誤，選
B。
5. C。文章主要介紹了交朋友的步驟和注意事項，即如何交朋友，選 C。
五、寫作
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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