從句
1、主語從句
引導(dǎo)詞有：that,what,whether,when,wherever,who 等,主語從句的謂語動詞必須用單數(shù).
舉例：
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、表語從句
一般位于系動詞之后.
舉例：
The question is that I also like her.
3、賓語從句
句型：主句 + 連詞 + 賓語從句
連接賓語從句的詞有：that,if,whether,who,whose,what,which,where,when,why,how,whoever,whomever,whenever,wherever 等》
舉例：
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、狀語從句
（1）時間狀語從句
引導(dǎo)時間狀語從句的連詞有：when,whenever,as,while,before,after,until,till,since,ever,as soon asimmediately,directly,hardly,hardly ...when 等.
舉例：
1) When I was in Shanghai,I met her.
2) Please wait until you are called.
（2）地點狀語從句
常由 where 何 wherever 引導(dǎo).
舉例：
He lives where the street crosses the river.
（3）原因狀語從句
常由 as,because,since,now that,seeing that 等引導(dǎo),其中語氣最強烈的就是 because.
舉例：
He has to leave off because he is seriously ill.
（4）條件狀語從句
常由 if,unless,as long as,so long as 等引導(dǎo).
舉例：
If you can correct your faults,your work is good.
（5）目的狀語從句
常由 so that,in order to 等引導(dǎo).
舉例：
Speak loudly so that every one may hear you clearly.
（6）比較狀語從句
常由 than,as,as ...as 等引導(dǎo).
舉例：
I have got as much money as I need.
（7）讓步狀語從句
常由 though / although,even though,as,if,even if 和 wh- + -ever 復(fù)合詞引導(dǎo).
舉例：
Although I tried my best to learn English,I haven't passed the exam.
（8）方式狀語從句
常由 as,as if,as though,how 等引導(dǎo).
舉例：
She looks as if she is still young.
（9）結(jié)果狀語從句
常由 that,so / such that 等引導(dǎo).
舉例：
She is such a good teacher that all the students love and respect her.
5、定語從句
結(jié)構(gòu)：
.先行詞（被修飾的名詞或代詞） + 關(guān)系代詞 / 關(guān)系副詞 + .
一般來說,修飾人用 who,whom,whose,that；修飾物用 that / which.
舉例：
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?.