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?
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