when 是对时间提问,比如：I get up at 6.对6提问：when do you get up? where 是对地点提问,比如：we will meet at our school gate.对at our school gate提问：where will we meet? what 是对物提问,比如：I like the cat?对cat 提问：what do you like? who 是对人提问,比如：she is my sister.对sister提问：who is she?
