【英语帮】老师熬夜整理，英语三大从句重点语法总结！
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）。
看完本篇你将获得：
1.初中三大从句引导词的基本用法
2.初中三大从句的注意事项
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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
先行词指人 who /that
先行词指物 which/ that
定语从句一般紧跟被修饰的名词或代词（即先行词）后
三、关系代词
关系代词代替先行词在句子中担当成分，所以从句中不可再出现其他代替先行词的代词
四、翻译方法 “…. 的”
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”
Harry is the boy whose mother is our math teacher.
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?
当关系代词前使用介词时：
物+介词+which
人+ 介词 + whom
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.
时间状语从句
①When 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.
When 当从句是进行时，主句是一般时，往往表示不满。
Someone knocked at the door when I was having breakfast.
When=after
When the children had gone to bed, she began to prepare her lessons.
②While 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.
③As 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.
④The moment =as soon as , immediately 一…就…
1）Did you remember to give Mary the money you owed her?
2）Yes, I gave her the moment I saw her.
⑤Not… until 直到…才
He didn’t leave the office until he finished the work.
⑥Before 在…之前
The passengers should arrive at the airport an hour before the flight departs.
⑦After 在…之后
The customer left the ticket counter after he had a quarrel with the ticket agent.
⑧Since 自从…
通常主句用现在完成时
1）I have never been there again since I graduated from the university.
2）It is just a week since we arrived here.
⑨As soon as =No sooner than 一…就…
1）Jack went to school as soon as he got well.
no sooner… than… 用于句首要求倒装
2）No sooner had he arrived than he went away again.
⑩Once 一但…就…
Once you see him, you will never forget him.
11.Every time/each time 每次
whenever 每当
Each time he came to town, he would visit our school.
条件状语从句
引导状语从句的连接词有：
If如果/ unless除非/ as long as只要/ As (so) far as据……所知/in case万一,/provided that假如,/on condition that若是，以…为条件
①If 如果
If you don’t hurry up, you will miss the plane.
②Unless=if not 如果不, 除非
We can’t get there on time unless we book the earliest flight
③As long as 只要
We will succeed as long as we keep on trying.
④As (so) far as 据……所知
As far as I know, he speaks English very well.
⑤In case 假使, 如果
The plane cannot take off in case it rains.
⑥Provided that 如果(有时省略 that)
The plane will be in good condition provided that it is taken care of carefully.
⑦On condition that 条件是…
He said that he would come to the meeting on condition that no one asked him to speak.
注:主从句的动作发生在将来时，则主句用将来时, 从句用一般现在时。
If he arrives tomorrow, I will be waiting for him at the airport.
地点状语从句
原因状语从句
because/as/since/now that/considering that/seeing that 这六个连词都用于表示表示原因, 但在语气上一个比一个弱。
①Because 因为
通常从句放在主句后
Mr Smith was very upset because he couldn’t find his luggage.
②As 因为
通常放在句首
As he is honest and modest, all his friends like him.
③Since 既然
因语气较弱, 常译为既然(众所周知的原因)
Since everybody has come, we can set off.
④Now that 既然
Now that you are here, you can join us.
⑤considering that 顾及到
Considering that they are just beginners, they are doing quite a good job.
⑥seeing that 由于
Seeing (that) quite a few people were absent, we decided to put the meeting off.
结果状语从句
引导结果状语从句的连词有：that/so that/so…that…
①such…that=So… that 太…以至于
so 后面应用形容词或副词, 有时省略so只用that
Boeing 747 is so large that people like to call it jet bomb.
②So that 因而，以便，为了
有时so 可以省去
Speak louder please so that the people at the back can hear you.
③Such …that… 太…以至于
用法与so…that相同，但such 后面应用名词
The foreign visitor was such a fast speaker that nobody could understand him.
目的状语从句
引导目的状语从句的主要连词有: that/so that/in order that/for fear that/lest
①(So) that 以便
从句中常常使用一些情态动词，如：can, could, may, might, should等
Let’s take the front seats (so) that we may see more clearly.
②in order that 为了
与so that 相同从句中常常使用一些情态动词，如：can, could, may, might, should等
School was closed early in order that the children might go home ahead of the storm.
③for fear that 生怕; 为了防止(某事发生)
He took the name down for fear that he should forget it.
④in case 万一
You should bring a dictionary in case you need it.
⑤Lest 以防万一
The man decided to tell his boss the fact lest he would be angry with him.
让步状语从句
引导让步状语从句的连词有：
Although/though/as
even if/even though/no matter
however/ whatever/ while/whether
①Although, though 虽然
although和though 可以互换，但although 常放在句首，though可以用于倒装。
1)Although it was raining, the plane managed to take off.
2)Though he did his best, he didn’t succeed.
②As 尽管
as 引导让步状语从句时，句子通常倒装，可与though 互换。
Busy as he is, he never misses a football match.
③Even if /even though 即使
Even if you don’t like your boss, you should do your work.
④However 不论
however 引导让步状语从句时，句子通常倒装
He couldn’t get there on time however fast he drove.
⑤No matter (what, when, where, how) 无论（什么，何时，何地，怎样）
He wouldn’t forgive me no matter how hard I begged him.
⑥Whatever 不管
Whatever other people may say, she won’t change her mind.
⑦While 尽管
While I have sympathy for you, I can’t help you.
⑧Whether 不管
常与or not 连用
Whether he is good or not, the company decided to send him abroad.
方式状语从句
方式状语从句常由: as/as if/as though
①as 与… 一样
Do in Rome as the Romans do.
②as if, as though 仿佛
由as if或 as though引导的从句中可用虚拟语气
She stood at the door as if (=as though) she were waiting for someone.