疑问副词 why丶where丶how丶when 等，会放在句首。这些问句的回答可以是完整的句子，也可以只用介词片语回答。在疑问副词形成的问句上，必须将主词和动词的位置互调，也就是说动词会先出现。
举例
- why are you so late? there was a lot of traffic.
- where is my passport? in the drawer.
- how are you? i'm fine.
- when does the train arrive? at 11:15.
how 的使用
用 how 形成问句的方法有四种；而单独用 how 则是意指「以何种方式」。
举例
- how did you make this sauce?
- how do you start the car?
- how can i get to your house?
how 可以和形容词连用来询问某个特性的程度。
举例
- how tall are you?
- how old is your house?
- how angry is mother?
how 可以和 much 或 many 连用来询问数量。much 后面接的是不可数名词，而 many 接的是可数名词。
举例
- how many people are coming to the party?
- how much flour do i need?
- how much are these tomatoes?
how 可以和其他副词连用来询问某个动作的频率或程度。
举例
- how quickly can you read this?
- how often do you go to london?
- how loudly does your brother scream?