这里只讲解其三个经典问句用法：

1．问人或事物的特点。例如：

What is he like? 他人怎么样啊？

What kind of suit did she buy in town? 她在城里买的是怎样的服装？

2．问有关事物的数量。例如：

What do you weigh? 你体重多少？

What did you pay for the dictionary? 这本词典你花了多少钱？

3.what if…?

What+ if引导的一个假设句子表示：要是…会怎么样呢 
what would happen if?

What if the train is late?

火车要是晚点会怎么样呢？

What if she forgets to bring it?

要是她忘记带来，会怎么样呢？