可以引导定语从句。who引导定语从句作句子的主语、宾语。定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导。who引导的定语从句的先行词是表示人的名词或代词。
疑问代词who的用法
1.who在句中作主语:
Who's there?
who作主语通常视为单数,谓语动词要用单数。
改错题: Who are not at school today?改为is
其他主语例句: Who came when I was out?
Who put the light out before I finished my work?
2. who在句中作宾语:
Who have you chosen to take part in the sports meet?
你选了谁参加运动会?
此句重点是:主语是you,谓语动词用have,不能把who当主语,谓语用has就错了。
其他例句:
Who did she lend the bike to?
Who did you see then?
3.who在句中作表语:
Who is she?
Who are this girl and this boy?
this girl and this boy是两个人并列作主语,谓语动词用复数。
who用作疑问代词时,意思是“谁”,一般只用来指人,在句中用作宾语或主语。
I wonder who that letter was from.
我不知道是谁来的信。
who用作限制性或非限制性的关系代词,意思是“…的人,那个…”“他,她,他们”,在句中作主语。如:
The people (who) we met in France have sent us a card.
我们在法国结识的人给我们寄来了一张贺卡。