1. 疑问代词做对陈述句的主语,宾语或定语提问,即做句子的主语,宾语或定语, 如what, who/ whom, whose. eg. Who is talking ? What can you see? Whose shirt is this? 2.疑问副词对时间,地点,方式等状语提问,如when, where, how 等. eg. When is your birthday? Where are you going? How do you know?