who:谁 often is used to stand for subject
whom:谁 often is used to stand for object
which:哪一个 often is used to ask questions
of which:no concrete translation in chinese."of which" lead clause in english,but in chinese,we often use compound sentence
whose:谁的
ex:who are you? 你是谁?or你是哪位?
he have three sons,two of whom are doctors. 他有三个儿子,其中两位是医生.
which answer is correct? 哪一个答案是正确的?
whose pen is this?这是谁的钢笔?
We have gathered nearly 100,000 quilts,of which up to half have gone to flood-hit areas.我们已经收集了十万条被子,一多半已送往洪区。