中考英语单项选择中三大从句是必考的内容，所以小伙伴们在复习的时候需要格外细心，其实只要掌握了一定的技巧和方法，相信小伙伴们一定能够全盘拿下！复合句包括并列复合句和主从复合句。其中主从复合句包括宾语从句、状语从句和定语从句。
1宾语从句
概念：在主从复合句中，在动词、介词、形容词后面充当宾语的句子叫做宾语从句。
构成：主句＋引导词＋陈述句语序 (主谓语序)
橙子妈妈口诀：学宾从，过三关，连词、语序和时态
引导词关：
① that (无意义，可省略)
② what， when， where， which， who， why， how, whose等特殊疑问词。
③ 连词whether， if (是否,初中阶段记住大多数考察的是if，因为它有两种用法)。
语序关
宾语从句的语序必须用陈述句语序。
时态关（主过从过，主现从现，客观真理一般时）
主句与宾语从句的时态规则：
① 主句是一般现在时，从句可用所需要的任何时态。
② 主句是过去时，从句必须用过去时的某一种。
③ 从句如果表示客观真理、客观事实时，不管什么时候都用一般现在时。
如：
I want to know if she will take part in the games.（主现从任意）
She didn't know when he would come back the next day.（主过从过）
My teacher told us that the earth goes around the sun.（客观真理一般时）
注意：
①当宾语从句的主语和主句的主语相同时，从句可以简化为“疑问词＋不定式”结构如：
They don't know what they should do next.
＝ They don't know what to do next.
Can you tell me how I can get to the library？
＝ Can you tell me how to get to the library？
②宾语从句的否定转移：如果主句谓语动词是think，believe，suppose等，而从句的意思是否定的，这时主句的谓语动词用否定式，从句用肯定式。
如：
I don't think she is right. 我认为你不对。
I don't believe she can finish his homework on time， can she？
我认为她不能按时完成工作，能吗？
【课堂检测】
1.—Excuse me, could you tell me ______？
—Well, there's one on your left.
A. when the bank opens
B. where the bank is
C. how far is the bank
D. how can Iget to the bank
2. The door bell is ringing, please go and see______.
A. who is it
B.who it is
C. who was it
D. who it was
3. —Judy, could you tell me______ the schoolbag?
—Oh, yes. I bought it in a store on theInternet.
A. where did you buy
B.where will you buy
C. where you bought
D.where you will buy
4. Could you please tell ______？
A. how can I make the machine work
B.how I can make the machine work
C. how I can make the machine to work
D. how can I make the machine to work
5. —Helen, could you tell me______ living in the countryside?
—Perhaps next weekend.
A. why you will visit your granny
B. when will you visit your granny
C. when you will visit your granny
D. why will you visit your granny
1～5 B B C B C
2
定语从句
概念：在复合句中，修饰名词或代词的句子，叫做定语从句。被修饰的词就叫先行词。
构成：先行词＋引导词＋定语从句
橙子妈妈解题秘诀：定语从句，先看先行词，辨清指人还是物。（橙子妈妈教大家一个最厉害的方法，中考英语选项中一旦出现that,基本上就可以锁定它，但是还是要具体情况具体分析噢）
① 先行词是人时：作宾语或主语时，引导词为who， whom， that；作定语时用whose.
② 先行词是物时，引导词为which， that.
③先行词是地点时，引导词为where.
④先行词是时间时，引导词为when.
⑤先行词是原因时，引导词为why.
特殊情况：
① 当先行词被最高级和序数词修饰时，引导词只能用that。
② 当先行词有some， any， all， little， much， few， none， something， everything，nothing， anything等词修饰时，引导词只能用that。
③ 当先行词前有the one， the only， the last， the very 等词修饰时，引导词只能用that。
④ 当先行词同时指人和物时，引导词只能用that。
⑤ 当those作先行词指人时，引导词只能用who。
【课堂检测】
1.This is the best book______ I have ever read. I like it very much.
A. which
B.that
C. who
D.when
2. I hate the dogs______ live in the next house. They make loud noises all night.
A.who
B.that
C.what
D.whom
3.She often parks her car near the house ______she can easily get to.
A.where
B.who
C.which
D.what
4.—Please tell me something about Yang Liwei.
—He is a great astronaut of ______ all the Chinese are proud.
A.that
B.whose
C.who
D.whom
5.Yesterday, Mr. Green went to his hometown and visited the old house ______he was born in.
A.which B.where
C.what D.it
1～5 B B C D A
3状语从句
概念：在复合句中，作状语成分的从句叫状语从句。常见的状语从句可分为：时间、原因、条件、方式、让步、比较、结果、目的等从句。
橙子妈妈解题秘诀：时间和条件状语从句（由if、when、as soon as等词引导的句子），使用主将从现！
(1) 主语从句中，主从句的时态要一致。
(2) 主将从现类（重点考察）
由as soon as，when(当……时候)， before， after，if(如果)， unless(除非)， until，even if 等引导的主从复合句中，如果主句是一般将来时态的时候（也可以是情态动词或祈使句），从句要用一般现在时表示将来。（主将从现）
如：I will call you （主句） when my brother comes back. （从句）
If you don't get up early （从句），you will not be late for school. （主句）
＝ Unless you get up early (从句)，you won't be late for school. （主句）
注意： when 意思为“当… 时候”时，引导的是状语从句，考虑主将从现；when 意思为“什么时候”时，引导的是宾语从句。
if 意思为“如果”时，引导的是状语从句，考虑主将从现；if 意思为“是否”时，引导的是宾语从句。
如：—Do you know if she will go for a trip with us ?
—She will go with us if she finishes his work.
—Do you know when she will come to Guangzhou ?
—I will tell you when she comes.
【课堂检测】
1. Why not look up thenew word in a dictionary you don’t know it?
A. if
B. that
C. though
D.whether
2. My parents are alwaysworried about what will happen if I .
A.succeeded
B. won’t succeed
C. will fail
D. fail
3.We will go to Tian’anmen Square to watch the raising ofnational flag if it ________ tomorrow.
A. will rain
B. rains
C. doesn’t rain
D.won’t rain
4..—I want to know if Mariaus_____ in the fashion show tonight.
—I believe if she ____her homework，she will join us.
A. joins；finishes
B. will join；finishes
C. joins；will finish
D. will join；will finish
5.—Dad， please tell me when Mum______ ，I miss her very much.
—She will return when she_____ her task. And she will bring a nice present for you.
A. returns； finishes
B.returns； will finish
C. will return； finishes
D. willreturn； will finish
1－5 ADCBC
中考英语三大从句是重点，小伙伴们掌握了吗？
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