初中英语牛津译林版（2024）九年级上册（2024）Grammar第3课时课后作业题

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unit8 Grammar — Using if and unless-讲义与练习
课时3 译林版初中英语九年级上册 (pp.107-109)
第一部分 知识点讲义
一、学习目标
1. 能够理解并掌握 if 条件句“主将从现”的时态规则，正确使用 if 引导的条件状语从句。
2. 能够理解 unless 的含义（= if ... nt），并熟练进行 unless 与 if ... nt 的句型转换。
3. 能够运用 if-/unless-clauses 谈论书籍、作家与读书计划，如向同学介绍一本书或一位作家。
4. 通过 Amy 与 Millie 的对话情境，能够在真实交际中准确选用 if 或 unless。
二、重点与难点
【重点】
• if 条件句的结构与时态规则：主句用 will/can/may/shuld + 动词原形，从句用一般现在时
• unless 的含义与用法：unless = if ... nt，从句用肯定形式表达否定意义
• unless 与 if ... nt 的相互转换
• if/unless 在对话与短文中的综合运用
【难点】
• unless 从句本身不再使用否定形式（unless yu read ≠ unless yu dn't read）
• 主句为否定句时，unless 与 if ... nt 转换后的语义对等
• 条件状语从句前置与后置时的标点使用
三、字词与词汇
四、语法与句型
句型一 if 条件句
【规则】if 引导条件状语从句，意为“如果……”。谈论将来可能发生的情况时，主句用一般将来时（will + 动词原形）或“情态动词 + 动词原形”，从句用一般现在时表示将来，即“主将从现”。
【结构】If + 主语 + 一般现在时, 主语 + will/can/may/shuld + 动词原形.（从句也可放在主句之后，此时不加逗号）
【教材例句】
• If yu like shrt stries, yu will lve O. Henry, wh wrte ver 600 shrt stries in his life.
• If yu want t read a stry with a surprise ending, yu shuld try an O. Henry stry.
• If yu need t find his bks, yu can ask the librarian where they are.
• If yu're interested, we culd g tgether.
句型二 unless 条件句
【规则】unless 意为“除非；如果不”，引导条件状语从句，相当于 if ... nt。从句用一般现在时表示将来，且从句本身用肯定形式表达否定意义。
【结构】Unless + 主语 + 一般现在时（肯定式）, 主语 + will/wn't + 动词原形.＝ 主语 + will/wn't + 动词原形 + if + 主语 + dn't/desn't + 动词原形.
【教材例句】
• Smetimes it can be hard t fully enjy gd literature unless yu read it carefully.
• Unless yu read a pem again and again, yu may nt understand the true meaning f it.
• We culd eat lunch there unless it rains.
• We culd g tmrrw mrning unless yu already have plans.
句型三 unless 与 if ... nt 的转换
【教材例句】
• Yu wn't knw what happens unless yu read t the end f the stry. = Yu wn't knw what happens if yu dn't read t the end f the stry.
• Unless yu lve science fictin, yu wn't like this bk. = If yu dn't lve science fictin, yu wn't like this bk.
【纠错天地】
五、学习支架
if/unless 语法速览卡
六、知识要点
要点1 if 条件句“主将从现”
【概念】if 引导的条件状语从句谈论将来可能发生的事情时，从句用一般现在时表示将来，主句用“will + 动词原形”或“情态动词 + 动词原形”。
【教材依据】If yu like shrt stries, yu will lve O. Henry...；If yu're interested, we culd g tgether.
【应用】先判断哪句是“条件”、哪句是“结果”：结果句用将来时或情态动词，条件句用一般现在时；切忌在 if 从句中使用 will。
要点2 unless 的意义与用法
【概念】unless = if ... nt，意为“除非；如果不”，引导的从句要用肯定形式表达否定意义。
【教材依据】Smetimes it can be hard t fully enjy gd literature unless yu read it carefully.
【应用】把 unless 从句“翻译”成 if ... nt 从句来检验语义：unless yu read it carefully = if yu dn't read it carefully。
要点3 unless 与 if ... nt 的转换
【概念】主句多为否定句（wn't / may nt）时，unless 与 if ... nt 可以互换，句意保持不变。
【教材依据】Yu wn't knw what happens unless yu read t the end f the stry. = Yu wn't knw what happens if yu dn't read t the end f the stry.
【应用】转换两步走：①去掉 unless，换成 if；②从句由肯定变为否定（加 dn't/desn't/nt），动词还原。主句保持不变。
要点4 条件从句的位置与标点
【概念】if/unless 从句既可放在主句之前（从句后加逗号），也可放在主句之后（不加逗号）。
【教材依据】Unless yu lve science fictin, yu wn't like this bk.（前置，有逗号）/ We culd eat lunch there unless it rains.（后置，无逗号）
【应用】写作时灵活安排从句位置使句式多样；从句前置时务必在从句后加逗号。
七、典型例题
【例1】 Yu wn't knw what happens at the end ______ yu read the stry carefully.
A. if B. unless
C. when D. because
【例2】 用 unless 改写句子：If yu dn't hurry, yu will miss the schl bus.
【例3】 If yu ______ (want) t read a stry with a surprise ending, yu shuld try an O. Henry stry.
第二部分 同步练习
★ 基础巩固
一、单项选择
1. ______ yu read a pem again and again, yu may nt understand its true meaning.
A. If B. Unless
C. When D. Thugh
2. If it ______ tmrrw, we will g t the bk fair.
A. desn't rain B. wn't rain
C. didn't rain D. nt rain
3. Yu will be late fr the writing class ______ yu leave right nw.
A. if B. unless
C. because D. s
4. —Shall we invite Sandy t the Bk Club? —Sure. She will certainly want t cme ______ she is nt busy.
A. unless B. if
C. until D. thugh
5. "Unless yu lve science fictin, yu wn't like this bk." means "______"
A. If yu lve science fictin, yu will like this bk.
B. If yu dn't lve science fictin, yu wn't like this bk.
C. Yu will like this bk even if yu dn't lve science fictin.
D. Yu lve science fictin, s yu will like this bk.
二、首字母填空
6. Yu wn't knw what h______ at the end f the stry unless yu read t the end.
7. If yu can't find the bk, yu can ask the l______ fr help.
三、句型转换
8. If yu dn't read the stry carefully, yu wn't understand it.（用 unless 改写句子，句意不变）
____________________________________________________________
★★ 能力提升
一、单项选择
1. The teacher will help yu cme up with a stry idea ______ yu are interested in writing.
A. if B. unless
C. until D. befre
2. We culd have lunch in the park near the bk fair ______ it rains.
A. if B. unless
C. when D. because
3. ______ we arrive at the bk fair early, there may nt be many bks left.
A. If B. Unless
C. When D. Because
二、阅读理解
Last Friday afternn, ur class had a special reading lessn in the schl library. Our English teacher, Ms Wang, brught a bx f shrt stries by O. Henry, wh wrte ver 600 shrt stries in his life.
"If yu want t knw a writer, yu shuld read his stries carefully," Ms Wang tld us. "And unless yu read t the end f an O. Henry stry, yu wn't enjy its surprise ending."
At first I fund the ld wrds in the stries difficult. "Yu wn't understand every wrd unless yu read the stry again," Ms Wang said with a smile. S I read my stry twice. The secnd time, I began t enjy it.
At the end f the lessn, we shared ur favurite parts. Li Hua said he wuld read mre shrt stries if he culd brrw the bks. Ms Wang tld him he culd ask the librarian where they were.
Nw I keep a ntebk fr my reading. If I meet a gd sentence, I write it dwn. I believe I will enjy literature mre if I keep reading carefully.
4. Where did the class have the special reading lessn?
A. In the classrm.
B. In the schl library.
C. At the bk fair.
D. In the park.
5. What des Ms Wang say abut O. Henry's stries?
A. They are t difficult fr students.
B. They all have happy endings.
C. Yu wn't enjy the surprise ending unless yu read t the end.
D. They are abut schl life.
6. What did the writer d when he fund the stry difficult?
A. He gave it up.
B. He read the last page first.
C. He read it twice.
D. He asked Li Hua fr help.
7. What des the writer d with gd sentences nw?
A. He writes them dwn in a ntebk.
B. He reads them t the class.
C. He translates them int Chinese.
D. He draws pictures fr them.
8. What can we learn frm the passage?
A. Reading carefully helps us enjy literature mre.
B. O. Henry wrte ver 600 pems in his life.
C. We shuld always read the last page f a stry first.
D. The writer dislikes shrt stries.
三、选词填空 从方框中选择适当的单词填空，每词限用一次。
fair invite unless carefully pem meaning if librarian happen replace
Our schl will hld a bk (9)__________ next week. Mr Wu says the schl will (10)__________ sme writers t talk with us. "Yu wn't enjy gd literature (11)__________ yu read it (12)__________," he tells us. S I plan t read a (13)__________ by Li Bai every mrning befre the fair. Smetimes I cannt get the (14)__________ f a line at first, but if I read it again and again, I can understand it. My friend Kitty wants t g t. (15)__________ she is free n Friday, we will g tgether. We want t ask the (16)__________ where the O. Henry bks are. Kitty says nthing will (17)__________ if we dn't hurry, s we plan t arrive early. In class we als learn that we can use if ... nt t (18)__________ unless.
四、书面表达
19. 学校读书节将至，请你向同学们推荐一位作家或一本书。请用 if 和 unless 从句写一段 80 词左右的推荐词。
提示：1. 你推荐谁/哪本书；2. 为什么推荐（至少使用两个 if 从句和一个 unless 从句）；3. 怎样可以找到这本书。
目标表达：If yu like ..., yu will lve ... / If yu want t ..., yu shuld ... / Yu wn't ... unless ... / Yu can ask the librarian ...
★★★ 拓展延伸
阅读下面短文，完成第 1-2 题。
Amy lves reading, but she used t read very fast. "Yu wn't really knw a bk unless yu read it slwly," her teacher nce tld her. Since then, Amy has changed her way f reading. Nw she reads each chapter twice. If she meets beautiful sentences, she cpies them int her ntebk. At the end f each mnth, she writes a shrt reprt abut the bk. Her classmates are surprised at hw much she remembers. "If yu read with yur heart," Amy says, "every bk becmes a friend."
1. What can we infer abut Amy nw?
A. She reads as fast as befre.
B. She has gd reading habits.
C. She dislikes writing reprts.
D. She reads nly ne bk a year.
2. The writer develps the passage mainly by ______.
A. cmparing tw writers
B. fllwing the rder f time
C. giving examples f famus bks
D. asking and answering questins单词
读音
词性
释义
教材例句
literature
__________
n.
__________
In literature, writers use wrds as artists use paints.
artist
__________
n.
__________
In literature, writers use wrds as artists use paints.
unless
__________
cnj.
__________
Yu wn't knw what happens unless yu read t the end f the stry.
carefully
__________
adv.
__________
Smetimes it can be hard t fully enjy gd literature unless yu read it carefully.
pem
__________
n.
__________
Pems, fr example, are ften difficult t understand.
meaning
__________
n.
__________
Unless yu read a pem again and again, yu may nt understand the true meaning f it.
replace
__________
v.
__________
Smetimes we can use if ... nt t replace unless.
happen
__________
v.
__________
Yu wn't knw what happens unless yu read t the end f the stry.
science fictin
__________
n.
__________
Unless yu lve science fictin, yu wn't like this bk.
end
__________
n.
__________
Yu wn't knw what happens unless yu read t the end f the stry.
librarian
__________
n.
__________
If yu need t find his bks, yu can ask the librarian where they are.
fair
__________
n.
__________
There's a bk fair in twn this week.
invite
__________
v.
__________
Shuld we invite Sandy t jin us?
❌ 错误
✅ 正确
If it will rain tmrrw, we will stay at hme.
__________
Unless yu dn't read t the end, yu wn't knw what happens.
__________
Yu will miss the early bus if yu will nt hurry.
__________
项目
从句（条件）
主句（结果）
教材例句
if 条件句
If + 主语 + 一般现在时
will/can/shuld/may + 动词原形
If yu like shrt stries, yu will lve O. Henry, wh wrte ver 600 shrt stries in his life.
unless 条件句
Unless + 主语 + 一般现在时（肯定式）
多为 wn't / may nt
Smetimes it can be hard t fully enjy gd literature unless yu read it carefully.
unless = if ... nt
unless yu read = if yu dn't read
主句保持不变，句意不变
Yu wn't knw what happens unless yu read t the end f the stry. = ... if yu dn't read t the end f the stry.