A who,whom,whose who作主语：Who keeps the keys?谁保管那些钥匙?（肯定动词） Who took my gun?谁拿了我的枪?（肯定动词） Who are these boys?这些男孩是谁?（疑问动词） who,whom作动词宾语：常用英语：Who did you see?你见到谁了?很正式的英语：Whom did the committee appoint?委员会指定了谁?whose作主语或主语的一部分：Whose car broke down?谁的车子发生了故障?（肯定动词） Whose（books）are these?这些（书）是谁的?（疑问动词） whose作动词宾语或主语的一部分：Whose umbrella did you borrow?你借了谁的雨伞?B which Which作主语或主语的一部分：Which pigeon arrived first?哪一只鸽子先到达的?（肯定动词） Which of them is the eldest?他们中谁的年龄最大?（肯定动词） which作动词宾语或宾语的一部分：Which hand do you use?你用哪一只手?Which of these dates would you prefer?这几个日期你喜欢哪一个?C what what作主语或主语的一部分：What caused the explosion?是什么引起爆炸的?（肯定动词） What kind of tree is that?那是哪种树?（肯定动词） what作动词宾语或宾语的一部分：What paper do you read?你经常看什么报纸?What did they eat?他们吃了什么?