疑問代詞who的用法
1.who在句中作主語：
Who's there?
who作主語通常視為單數，謂語動詞要用單數。
改錯題： Who are not at school today?改為is
其他主語例句： Who came when I was out?
Who put the light out before I finished my work?
2. who在句中作賓語：
Who have you chosen to take part in the sports meet?
你選了誰參加運動會？
此句重點是：主語是you，謂語動詞用have，不能把who當主語，謂語用has就錯了。
其他例句：
Who did she lend the bike to?
Who did you see then?
3.who在句中作表語：
Who is she?
Who are this girl and this boy?
this girl and this boy是兩個人并列作主語，謂語動詞用復數。
who用作疑問代詞時，意思是“誰”，一般只用來指人,在句中用作賓語或主語。
I wonder who that letter was from.
我不知道是誰來的信。
who用作限制性或非限制性的關系代詞，意思是“…的人，那個…”“他，她，他們”,在句中作主語。如：
The people (who) we met in France have sent us a card.
我們在法國結識的人給我們寄來了一張賀卡。