關(guān)系代詞常在從句中擔(dān)任主語、賓語或表語等成分；關(guān)系副詞常在從句中擔(dān)任狀語。另外，在使用上面的這些關(guān)系詞時(shí)，有幾個(gè)問題值得我們注意：
首先，只能用whether而不能用if的情況
1）引導(dǎo)主語從句，例如：
Whether we'll make a loan for the project has not been decided .
（正確）我們是否要為這個(gè)項(xiàng)目還沒有定下來。
OR：It has not been decided whether we'll make a loan for the project . （正確）
If we'll make a loan for the project has not been decided .（錯(cuò)誤）
OR：It has not been decided if we'll make a loan for the project . （錯(cuò)誤）
2）作介詞的賓語，例如：
I have no idea about whether I can raise the money for buying a car . （正確）
我不知道我是否能為買車籌措到資金。
I have no idea about if I can raise the money for buying a car . （錯(cuò)誤）
3）后接不定式 ，例如：
He didn't know whether to go all himself first or wait for
her here.（正確）他不知道是他自己先去還是在這兒等她。
He didn't know if to go all himself or wait for her here . （錯(cuò)誤）
（4）后接or not ，例如：
We wonder whether they'll come in time or not.（正確）
我們擔(dān)心他們會(huì)不會(huì)準(zhǔn)時(shí)到。
We wonder if they'll come in time or not . （錯(cuò)誤）
其次，what引導(dǎo)的名詞從句表達(dá)的意思是"……所……的".這個(gè)"所怎么的"定義根據(jù)"從句謂語的動(dòng)作意義"而定。例如：
I don't understand what you said.我不理解你所說的話。
What he needs is to practice more.他所需要的是勤于練習(xí)。
Money is what she is really after.金錢是她所真正追求的東西。
People have different ideas about what happiness means .
人們對(duì)于幸福的含義有不同見解。
最后，要了解 -ever = no matter ，用于表示強(qiáng)調(diào)，意為"無論……".也就是說：
whatever = no matter what（無論什么）
whoever = no matter who（無論誰）
whichever = no matter which（無論那個(gè)）
whenever =no matter when （無論何時(shí)）
wherever = no matter where（無論何地）
however = no matter how （無論怎樣）
A 主語從句
用作主語的主謂結(jié)構(gòu)稱之為主語從句。例如：
Whether he'll come or not remains a question .
他是否會(huì)來依然是一個(gè)問題。
Whoever says that is not allowed .
無論誰這樣說都是不允許的。
That she reads English aloud every morning helps her a
lot in the improvement of her English study .
她每天早晨朗讀英文對(duì)提高她的英語學(xué)習(xí)起了很大的作用。
首先，只能用whether而不能用if的情況
1）引導(dǎo)主語從句，例如：
Whether we'll make a loan for the project has not been decided .
（正確）我們是否要為這個(gè)項(xiàng)目還沒有定下來。
OR：It has not been decided whether we'll make a loan for the project . （正確）
If we'll make a loan for the project has not been decided .（錯(cuò)誤）
OR：It has not been decided if we'll make a loan for the project . （錯(cuò)誤）
2）作介詞的賓語，例如：
I have no idea about whether I can raise the money for buying a car . （正確）
我不知道我是否能為買車籌措到資金。
I have no idea about if I can raise the money for buying a car . （錯(cuò)誤）
3）后接不定式 ，例如：
He didn't know whether to go all himself first or wait for
her here.（正確）他不知道是他自己先去還是在這兒等她。
He didn't know if to go all himself or wait for her here . （錯(cuò)誤）
（4）后接or not ，例如：
We wonder whether they'll come in time or not.（正確）
我們擔(dān)心他們會(huì)不會(huì)準(zhǔn)時(shí)到。
We wonder if they'll come in time or not . （錯(cuò)誤）
其次，what引導(dǎo)的名詞從句表達(dá)的意思是"……所……的".這個(gè)"所怎么的"定義根據(jù)"從句謂語的動(dòng)作意義"而定。例如：
I don't understand what you said.我不理解你所說的話。
What he needs is to practice more.他所需要的是勤于練習(xí)。
Money is what she is really after.金錢是她所真正追求的東西。
People have different ideas about what happiness means .
人們對(duì)于幸福的含義有不同見解。
最后，要了解 -ever = no matter ，用于表示強(qiáng)調(diào)，意為"無論……".也就是說：
whatever = no matter what（無論什么）
whoever = no matter who（無論誰）
whichever = no matter which（無論那個(gè)）
whenever =no matter when （無論何時(shí)）
wherever = no matter where（無論何地）
however = no matter how （無論怎樣）
A 主語從句
用作主語的主謂結(jié)構(gòu)稱之為主語從句。例如：
Whether he'll come or not remains a question .
他是否會(huì)來依然是一個(gè)問題。
Whoever says that is not allowed .
無論誰這樣說都是不允許的。
That she reads English aloud every morning helps her a
lot in the improvement of her English study .
她每天早晨朗讀英文對(duì)提高她的英語學(xué)習(xí)起了很大的作用。