从句
1、主语从句
引导词有：that,what,whether,when,wherever,who 等,主语从句的谓语动词必须用单数.
举例：
1) That he will fall the exam is certain.
2) What she said is true.
3) It doesn't matter when she leaves.
4) Whoever is tired may rest.
2、表语从句
一般位于系动词之后.
举例：
The question is that I also like her.
3、宾语从句
句型：主句 + 连词 + 宾语从句
连接宾语从句的词有：that,if,whether,who,whose,what,which,where,when,why,how,whoever,whomever,whenever,wherever 等》
举例：
1) He said that he was the first to clamb to the top of the mountain.
2) I wonder if / whether you could lend me tour bike.
3) Parents shouldn't give their children whatever they want.
4) She doesn't know who will come.
5) He asked if / whether she had an apartment in the city.
6) Who do you think they will travel with?
4、状语从句
（1）时间状语从句
引导时间状语从句的连词有：when,whenever,as,while,before,after,until,till,since,ever,as soon asimmediately,directly,hardly,hardly ...when 等.
举例：
1) When I was in Shanghai,I met her.
2) Please wait until you are called.
（2）地点状语从句
常由 where 何 wherever 引导.
举例：
He lives where the street crosses the river.
（3）原因状语从句
常由 as,because,since,now that,seeing that 等引导,其中语气最强烈的就是 because.
举例：
He has to leave off because he is seriously ill.
（4）条件状语从句
常由 if,unless,as long as,so long as 等引导.
举例：
If you can correct your faults,your work is good.
（5）目的状语从句
常由 so that,in order to 等引导.
举例：
Speak loudly so that every one may hear you clearly.
（6）比较状语从句
常由 than,as,as ...as 等引导.
举例：
I have got as much money as I need.
（7）让步状语从句
常由 though / although,even though,as,if,even if 和 wh- + -ever 复合词引导.
举例：
Although I tried my best to learn English,I haven't passed the exam.
（8）方式状语从句
常由 as,as if,as though,how 等引导.
举例：
She looks as if she is still young.
（9）结果状语从句
常由 that,so / such that 等引导.
举例：
She is such a good teacher that all the students love and respect her.
5、定语从句
结构：
.先行词（被修饰的名词或代词） + 关系代词 / 关系副词 + .
一般来说,修饰人用 who,whom,whose,that；修饰物用 that / which.
举例：
1) The road which through our school is very wide.
2) This is the school where my brother studies
3) Is there anything that you don't understand?.