在初中的英语学习中，
主要有三大从句，
即宾语从句、定语从句、状语从句（包括时间、条件、结果、目的、原因、让步、地点、方式等）。
小E为大家整理了“从句”相关的知识点！
赶快学起来吧~
宾语从句
01
一、定义
在句子中起宾语作用的从句叫做宾语从句。
二、连接词
that: I think that you can pass the exam.
Whether/if: I don’t know what the word means.
“Wh”: I don’t know what he said.
易错点：只用whether的情况：
1. 与or not连用：
I don’t know whether it’s raining or not.
2. 与动词不定式连用：
He doesn’t know whether to accept the invitation.
3. 连接词前有介词时：
It depends on whether he is coming.
三、时态
1. 主现从任
主句是一般现在时态，从句根据实际情况而定(各种时态均可)
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She wants to know what he has done for the exam.
2.主过从过
主句是一般过去时态，从句用相应的过去的时态。
She said that she was a student.
She said that she would fly to Japan in a week.
She said that she had finished her homework already.
3. 真理永现
如果宾语从句说的是客观真理、自然现象或事实时，这时宾语从句要用一般现在时态。
The teacher said that the earth goes round the sun.
02
定语从句
一、定义
在复合句中修饰名词、代词的从句叫定语从句。
二、先行词
先行词是被定语从句所修饰的名词、代词，在主句中充当一定的部分。
This is the book which I am looking for.
它是我正在寻找的书。其中的“the book”是先行词，“which”是关系代词。
三、关系代词
Whom: 先行词指人，则代替先行词在定语从句中充当宾语（包括介词的宾语），与who的区别是如果前面带介词则必须用whom
1. This is the teacher whomwho we like best.
2. I don’t like the boy to whom you are talking.
Whose : 指人或物，作定语，表示 “…的”
eg: Harry is the boy whose mother is our math teacher.
易错点：关系代词只能 that 的特殊情况：
1.先行词前有序数词修饰时：
This is the first gift that my parents bought me.
2.先行词前有形容词最高级修饰时：
This is the most exciting film that I have ever seen.
3. 先行词是不定代词something, anything等时.
Is there anything that you want in this shop？
4. 先行词是人和物时, 用that.
He talked about some writers and books that were unknown to us all.
5. 先行词被all , little , the only , the very(就是，正是), the last 等词修饰时,只能用that
This is the last place that I want to visit.
6. 特殊疑问句以who 或which 开头，只能用that引导.
Who is the girl that is making a speech on the platform?
易错点：当关系代词前使用介词时：
物+介词+which ; 人+ 介词 + whom
易错点：当关系代词前使用介词时：
1. This is the train by which we went to Beijing.
2. This is the teacher to whom my mother is talking.
状语从句
03
一、定义
在复合句中由从句表示的状语称作状语从句，它可以用来修饰谓语（包括非谓语动词）、定语或状语，或是整个句子。
二、状语从句一般分为八大类
时间状语从句 地点状语从句
原因状语从句 目的状语从句
结果状语从句 条件状语从句
方式状语从句 让步状语从句
1. 时间状语从句
When ---当……时候, 通常指某一特定的时间点，主句与从句的动作同时发生。
When I opened the window, I saw him come up.
When --- 正在……的时候，突然…。通常主句是进行时或be about to 时，在翻译的时候，when 可以译成“没想到”或“突然”。
I was walking along the street , when I met him.
While ---在……期间，往往指一段时间。
While we were inAmerica, we saw him twice.
While ---表示一种不满情绪，意思是这边在干某种重要的事，而另一边在享受等。
We are cleaning the classroom while they are playing the football.
As --- 一边……一边, 随着
She was doing her homework as she was listening to the music.
As --- 当……时，指一个动作紧接着一个动作发生，从句通常用进行时。
As I was going out, it began to rain.
The moment --- 一……就…… =as soon as, immediately
---Did you remember to give Mary the money you owed her?
---Yes, I gave her the moment I saw her.
Not… until --- 直到……才
He didn’t leave the office until he finished the work.
Before --- 在……之前
The passengers should arrive at the airport an hour before the flight departs.
After ---在…… 之后
The customer left the ticket counter after he had a quarrel with the ticket agent.
Since ---自从……, 通常主句用现在完成时
I have never been there again since I graduated from the university.
It is just a week since we arrived here.
As soon as --- 一……就……
Jack went to school as soon as he got well.
Once --- 一但……就……
Once you see him, you wil
