疑問副詞：
用來引導(dǎo)特殊疑問句，表示時(shí)間，地點(diǎn)，方式，原因等。
常見的有：when,where,how,why等。
疑問副詞的用法：
1.疑問副詞是問何時(shí)、何地、如何、因何的副詞，主要有when, where, how, why。
2.疑問副詞用在句首。
How long have you been staying in America?
你在美國待多久了?
3.疑問副詞在句中引導(dǎo)名詞子句。
I want to know where she has gone.
我想知道她去哪里了。
4.疑問副詞后接不定詞構(gòu)成的名詞片語，在句中可以作主詞、受詞或主詞補(bǔ)語。
How to solve the problem gives him a bad headache.
如何解決這個(gè)問題使他傷透腦筋。
（How to solve the problem作主詞。）
I don't know how to answer the question.
我不知道如何回答這個(gè)問題。
�。╤ow to answer the question作受詞。）
The patient is in urgent need the medicine, but the problem is where to get it.
這個(gè)病人急需這種藥,但問題是哪里能找到。
（where to get it作主詞補(bǔ)語。）
5.疑問副詞引導(dǎo)的名詞子句可作主詞、受詞或主詞補(bǔ)語。
When we are to start the competition hasn't fixed yet.
我們什么時(shí)候開始比賽還沒有定下來。
�。╓hen we are to start the competition作主詞。）
She asked her husband where he had been.
她問她丈夫去哪里了。
�。╳here he had been 作受詞。）
The question is when we can finish our work.
問題是我們何時(shí)能完成我們的工作。
（when we can finish our work作主詞補(bǔ)語。）
疑問代詞與疑問副詞的區(qū)別：
1. 疑問代詞做對(duì)陳述句的主語，賓語或定語提問，即做句子的主語，賓語或定語，如what, who/ whom, whose.
eg. Who is talking ? What can you see?
Whose shirt is this?
2.疑問副詞對(duì)時(shí)間，地點(diǎn)，方式等狀語提問，如when, where, how 等.
eg. When is your birthday? Where are you going?
How do you know?
常見的疑問代詞：what who which whom(只做賓語）
疑問副詞：how where when
還有whether是疑問連接詞。