我想问一下英语里WHO的用法,是既能做宾语又能做主语吗,能举个例子嘛

Who should I ask for？我应该向谁求救？此处who就是宾语；其实who很多时候看似主语都是倒装的，其实还是表语或者宾语，如who are you？
who还可以引导定于从句，在从句中做主语，例如，this is the person who helped me just now。这就是刚才帮助我的那个人；
希望你能明白；

按照严格的规范是不行的，who只能作主语，whom做宾语，但是现在要求并不太严格，who也可以用来作宾语，比如：
1.作主语 I don't know who went out.
2.作宾语 I don't know who you are.

WHO
abbr.
1. =World Health Organization (联合国)世界卫生组织
who
KK: []
DJ: []
pron.
1. (用作疑问代词)谁,什么人
Did Mary tell you who that girl's father is?
玛丽有没有告诉你那女孩的父亲是谁?
Who has borrowed my pen?
谁借了我的钢笔?
2. (用作限定关系代词)...的人
The girl who spoke is my best friend.
那讲话的女孩是我最好的朋友。
3. (用作非限定关系代词)他;她;他们;她们
I went to the movies with Mary, who I think you once met.
我与玛丽一起去看电影。我想你见过她。
4. 【古】(省略先行词的关系代词)...的人

关系代词who与whom 的用法区别 两者均只用于人，从理论上说，who 为主格，whom为宾格。如：Where’s the girl who sells the tickets? 卖票的女孩在哪里？ The author whom you criticized in your view has written a letter in rep