众所周知,英语的疑问句通常有四种,即一般疑问句、特殊疑问句、反意疑问句和选择疑问句.但还有一种复杂的形式,如What do you think I should do?这一类句型,被称之为混合疑问句.学习和运用混合疑问句时要注意以下几点：
1．这种疑问句的句型为：“疑问词＋do you think ／ believe ／imagine．．．＋其它（正常词序）”.常用于这种结构的动词为think,guess,suggest,suppose,hope,say,believe,imagine等.例如：
What do you think has happened?你认为发生了什么事情?
Who do you suppose would believe that story?你想谁会相信那个故事呢?
Which way do you imagine he went?你猜他走的哪条路?
注：有时作主句的谓语可以是：“连系动词＋形容词”.这类形容词有sure,afraid,glad,certain,pleased,surprised等.例如：
Who are you sure will win the game?谁将取胜,你有把握吗?
What was he afraid would cause his failure?他担心的是什么会导致他的失败呢?
2．这种疑问句常用来征询对方对某一疑问点的判断、认识、看法、猜测等等,或者请求对方重复一遍.例如：
What do you think is the matter with the TV set?你认为电视机怎么啦?
How do you believe they will come here?你认为他们将如何到这儿来?
Which part of this book do you think is the most interesting?这本书中你认为哪一部分最有趣?
When do you think the meeting will be held?这个会议什么时候开,你看（认为）呢?
3．在口语中,可以把do you think一类的插入语放在句末,带有补叙的性质.例如：
What is it,do you think?你看这是什么?
It must be a very good book,don't you think?这准是一本很好的书,你说呢?
4．这种疑问句与以know,tell,ask,hear等作谓语动词,其后带宾语从句的一般疑问句不同,其答语形式也不同.试比较：
①Do you know how much the room costs?
②How much do you think the room costs?
说明：①句答语是：Yes,I do．或No,I don't．而②句问的与How much does the room cost?一样,do you think是一般疑问句插入作主句,所以答语不用yes或no,只能说：I think the room costs 300 dollars．或The room costs 300 dollars,I think．
