内容正文:
译林英语九上Unit8语法讲解及习题:
if引导条件状语从句 & unless引导条件状语从句
1、 语法
本单元语法分为两大板块:A Using if(if 引导真实条件状语从句);B Using unless(unless 引导条件状语从句),话题围绕文学、阅读、写作、书籍、作家展开。
板块 A:if 引导真实条件状语从句(主将从现)
1. 核心定义
if 意为 “如果”,描述可能发生的条件与对应的结果,即满足 if 从句的条件,主句的事情就会发生。
2. 核心规则「主将从现」
1. if 引导的条件从句:永远用一般现在时;
2. 主句:三种可选结构
① 一般将来时(will + 动词原形)
② 情态动词(can /should/may /must + 动词原形)
③ 祈使句(动词原形开头)
3. 位置规则:if 从句可放句首或句尾;从句放句首时,主句前必须加逗号隔开。
例句
1. If you love short stories, you will enjoy O. Henry’s works.(从句前置,主将从现)
2. You can learn more writing skills if you read widely.(从句后置,情态动词主句)
3. If you want to write good poems, practise every day.(主句为祈使句)
板块 B:unless 引导条件状语从句
1. 核心含义
unless = if … not,意为 “除非;如果不”,描述只有满足 unless 的条件,主句事情才成立,本质是反面条件。
2. 两大核心规则
1. 时态同样遵循「主将从现」:unless 从句用一般现在时,主句将来 / 情态 / 祈使句;
2. 同义转换公式:
unless + 肯定从句 = if + 主语 + not + 动词
例:Unless you read the story carefully, you won’t find the surprise ending.
= If you don’t read the story carefully, you won’t find the surprise ending.
3. 位置灵活:unless 从句可放句首或句尾;前置加逗号。
例句
1. You won’t understand the poem unless you read it many times.
2. Unless you put enough time into writing, you can’t finish a good novel.
if & unless 对比速记表
连词
含义
逻辑关系
同义替换
时态规则
if
如果
满足条件,结果发生
无
从句一般现在,主句将来 / 情态 / 祈使
unless
除非,如果不
不满足条件,结果不发生
if … not
从句一般现在,主句将来 / 情态 / 祈使
必考易错点
1. 绝对不能出现:If you will read books, you learn a lot.(从句不能用将来时)
2. unless 本身自带否定含义,从句内部不能再加 not;
错:Unless you don’t read, you can’t learn.
对:Unless you read, you can’t learn.
3. if … not 可完整替换 unless,但 unless 语气更强、更书面。
二、专项练习题
题型一:单项选择
1. __________you finish reading the novel, you will know the surprise ending.
A. If B. Unless C. Though D. Because
2. You __________improve your writing unless you practise every day.
A. will B. won’t C. can D. should
3. If you __________interested in poems, you can join the school literature club.
A. are B. will be C. were D. is
4. Unless it __________tomorrow, we will go to the book fair together.
A. rain B. rains C. will rain D. raining
5. —Can I borrow this storybook?
—Sure, you __________take it home if you __________it back in three days.
A. can; bring B. will; will bring C. can; will bring D. will; bring
6. You won’t know how great this writer is __________you read his books.
A. if B. unless C. when D. though
7. If you __________hard enough, you __________write wonderful stories one day.
A. work; will B. will work; will C. work; can D. will work; can
8. __________you don’t take notes while reading, you will forget many details.
A. If B. Unless C. Though D. So
9. We will share our favourite books __________we have enough time after class.
A. unless B. if C. until D. though
10. Unless she __________more novels, she won’t pass the writing test.
A. read B. reads C. will read D. reading
11. If your brother __________science fiction, he will love this new book.
A. like B. likes C. will like D. liked
12. You __________miss the book talk unless you leave right now.
A. don’t B. won’t C. will D. can
题型二:选词填空( if /unless )
1. __________you keep reading every week, your vocabulary will become richer.
2. You can’t understand the deep meaning of the poem __________you read it three times.
3. We will visit the library this weekend __________there is no heavy rain.
4. __________you don’t finish your reading task, the teacher will talk with you.
5. You will find writing fun __________you try to create your own short story.
6. __________you prepare well for the speech, you won’t speak smoothly about your favourite writer.
题型三:句型转换
1. If you don’t study literature, you won’t know many great writers.(用 unless 改写)
2. You can’t enjoy this novel unless you love surprise endings.(用 if … not 改写)
3. If you don’t take part in the writing competition, you will lose a good chance.(unless)
4. Unless you read O. Henry’s stories, you won’t feel the beauty of short stories.(if … not)
5. If you don’t discuss books with classmates, you can’t get new ideas.(unless)
6. You won’t finish the article unless you put in enough time.(if … not)
题型四:单句改错
1. If you will read more books, you will become a better writer.
错误:__________改正:__________
2. Unless you don’t write every day, your skills won’t improve fast.
错误:__________改正:__________
3. You can learn lots of new words if you will keep reading poems.
错误:__________改正:__________
4. Unless it will rain tomorrow, we will hold the literature class outside.
错误:__________改正:__________
5. If you not finish your book report, the teacher will be upset.
错误:__________改正:__________
题型五:中英互译
1. If you look for surprise endings, you will fall in love with O. Henry’s works.
中文翻译:_____________________________________________________________________
2. 除非你仔细读这首诗,否则你体会不到它的美。(unless)
英文翻译:_____________________________________________________________________
3. You can borrow any book from the library if you show your student card.
中文翻译:_____________________________________________________________________
4. 如果我们早点到书展,我们就能买到这本绝版小说。(if)
英文翻译:_____________________________________________________________________
5. Unless you talk with the writer, you won’t know his creation ideas.
中文翻译:_____________________________________________________________________
三、习题完整答案 + 逐题解析
题型一:单项选择
1. A
解析:if 引导条件,“如果你读完这本小说,就会知道意外结局”,unless 逻辑相反。
2. B
解析:unless=if not,“除非每天练习,否则你不会提升写作”,主句用否定 won’t。
3. A
解析:if 从句遵循主将从现,主语 you 搭配 be 动词 are。
4. B
解析:unless 从句用一般现在时,主语 it 三单,动词加 s rains。
5. A
解析:主句用情态动词 can,if 从句一般现在时 bring。
6. B
解析:unless=if not,“除非你读他的书,否则不会知道这位作家有多优秀”。
7. A
解析:从句一般现在 work,主句将来 will write,主将从现。
8. A
解析:if 引导反面条件,“如果你读书不做笔记,会忘记很多细节”。
9. B
解析:if 表条件 “如果课后有充足时间,我们就分享喜欢的书”。
10. B
解析:unless 从句一般现在,主语 she 三单 reads。
11. B
解析:if 从句一般现在,主语 brother 三单 likes。
12. C
解析:unless=if not,“除非你现在立刻出发,否则你会错过读书分享会”,主句肯定 will miss。
题型二:选词填空
1. If
解析:正面条件,“如果你每周坚持阅读,词汇量会变丰富”。
2. unless
解析:反面条件,“除非读三遍,否则无法理解诗歌深层含义”。
3. if
解析:“如果没有大雨,我们周末去图书馆”。
4. If
解析:if 引导否定从句,“如果你完不成阅读任务,老师会找你谈话”。
5. if
解析:“如果你试着创作短篇故事,会发现写作很有趣”。
6. Unless
解析:unless=if not,“除非你好好准备演讲,否则介绍作家时讲不流畅”。
题型三:句型转换
1. Unless you study literature, you won’t know many great writers.
解析:if not 直接替换为 unless,从句变肯定。
2. If you don’t love surprise endings, you can’t enjoy this novel.
解析:unless 句子转换为 if + 主语 not 结构。
3. Unless you take part in the writing competition, you will lose a good chance.
4. If you don’t read O. Henry’s stories, you won’t feel the beauty of short stories.
5. Unless you discuss books with classmates, you can’t get new ideas.
6. If you don’t put in enough time, you won’t finish the article.
题型四:单句改错
1. 错误:will read;改正:read
解析:if 条件从句只能用一般现在,不能加 will。
2. 错误:don’t;去掉 don’t
解析:unless 本身自带否定含义,从句不能再加 not。
3. 错误:will keep;改正:keep
解析:从句禁用将来时,改为一般现在。
4. 错误:will rain;改正:rains
解析:unless 从句遵循主将从现,三单 rains。
5. 错误:not finish;改正:don’t finish
解析:if 从句实义动词否定需要助动词 don’t。
题型五:中英互译
1. 翻译:如果你喜欢意外式结局,你会爱上欧・亨利的作品。
2. 翻译:Unless you read this poem carefully, you can’t feel its beauty.
3. 翻译:如果你出示学生证,你可以从图书馆借阅任意书籍。
4. 翻译:If we arrive at the book fair early, we can buy this out-of-print novel.
5. 翻译:除非你和这位作家交谈,否则你不会了解他的创作思路。
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