在英语语法中，疑问代词和疑问副词虽然看起来相似，但用法有很大的区别。疑问代词用于代替名词，可以作为主语、宾语或表语，如who，whom，what，which和whose。而疑问副词用于询问地点、时间、方式或原因，只能用于疑问句子中，如where，when，how，why和how much/how many。
疑问代词
疑问代词用于代替一个名词，通常出现在一个疑问句子中。最常用的疑问代词有who，whom，what，which和whose。
- Who are you?
- Whom did you see at the party?
- What is your favorite color?
- Which book do you want to read?
- Whose phone is this?
需要注意的是，疑问代词可以作为主语、宾语或表语。例如：
- Who stole my phone?（主语）
- Whom did you give the book to?（宾语）
- What is your job?（表语）
疑问副词
疑问副词用于询问一个地点、时间、方式或原因。最常用的疑问副词有where，when，how，why和how much/how many。
- Where is the nearest coffee shop?
- When did you arrive at the airport?
- How did you learn to play the guitar?
- Why are you studying English?
- How much money do you have in your wallet?
需要注意的是，疑问副词只能用于疑问句子中，不能作为名词的替代。
