疑問代詞和關係代詞的區別

關係代詞who， whom， whose， which， that是用用引導定語從句的：

1. who/whom/that

三者都可指代人: who作主語， whom 作賓語， that既可以作主語， 又可作賓語。

如:

he is a good teacher who/that is loved by all.

here is the man (whom) you are looking for.

2. whose 可修飾人，也可修飾物 修飾物時， 可與of which換用，whose在定語從句中作定語。

如:

I saw some trees whose leaves were black with diseases.

= I saw some trees the leaves of which were black with diseases.

3. that/which/that/which指代物， 在定語從句中可作主語或賓語。如:

emei is a wonderful place which/that is worth visiting.

the film (which/that) we saw last night is wonderful.

疑問代詞用於特殊疑問句中，疑問代詞一般放在句子的最前面，在句中可用作主語、賓語、表語、定語。

whose sweaters are these? (定語)

what class are you in， tom? (定語)

whom are you looking for? 你在找誰? (賓格)

what is that? 那是什麼?(表語)

who was here just now? 剛才誰來過這兒? (主格)

(一般說來who在句子中作主格，whom在句子中作賓格)

which one do you like， this one or that one? 你喜歡哪一個，這個還是那個?(定語