1、what用于疑问句中询问所不知道的信息，是什么的意思，例如，What do you want? 你想要什么？What time is it? 几点了？What kind of poetry does he like? 他喜欢哪种诗？
2、what有用于动词和形容词后以引导关系从句，例如，I didn't know what else to say. 我不知道还有什么要说。
3、what用于指全部的量，是所有的意思，例如，He drinks what is left in his glass as if it were water. 他把杯子里剩下的东西当水一样全喝了下去。
4、what也用在感叹句中强调某种意见或反应，是多么的意思，例如，What a horrible thing to do. 做这样的事简直太可怕了！
