1. 我们可以用“疑问词+动词不定式”结构做动词的宾语。

疑问词包括疑问代词 what 、which 、who 和
疑问副词how 、when 、where 等。

但所有疑问词中，只有why 不可以和动词不定式连用。

2. 常和“疑问词+动词不定式”结构连用的动词及短语有：know 、learn 、see 、hear 、ask 、tell 、advise 、decide 、explain 、find out.
另外，“疑问词+动词不定式”结构前，有时也可以是 sure 、clear 等的形容词 翻译：(1)我不知道该做什么。

I don’t know what to do.
(2)你怎么知道在那里可以找到我？How did you know where to find me ?
(3)我不确定下面该做什么。

I am not sure what to do next.
3.注意：
（1）有些动词，如advise, ask, show, teach, tell 等，其后可以接双宾语。

（2）有些疑问词，如what, which, whose, how many, how much 等，其后先接一
个名词再接动词不定式。

（3）“疑问词+动词不定式”结构在句子中可以做主语和表语。

（4）“疑问词+动词不定式”结构可以改写成由该疑问词引导的从句。

练习：
（1）Sandy 问我怎样去那。

Sandy asks me how to go there.
（2）他不知道该带多少钱。

He doesn’t know how much money to take.
（3）何时开始是一个问题。

When to start is a question.
（4）我的问题是在哪里可以找到答案。

My question is where to find the answer.
一、单项选择
（）1. —I will go to Harbin for my summer vacation. What about you ?
—I haven’t decided where ______.
A. go
B. went
C. going
D. to go
（）2. I haven’t decided when _____a holiday yet.
A. took
B. taking
C. to take
D. take
（）3.—Can I help you ,dear?
—Yeah, I do not know_____ a banana milk shake. Maybe you can help me.
A. what to do
B. when to make
C. how to make
D. why to do
二、句型转换(同义句转换）
1. He showed me how I can start the online tour.
She showed me the online tour.
2. I don’t know what he said.
I don’t know _______ ______ _______.
3. Tom forgot when he met his friends
Tom forgot _____ ______ ______his friends.
4. Sandy is wondering where she asks for help.
Sandy is wondering _______ ________ ________ for help.
5. Amy does not know how she writes the report.
Amy does not know _____ _______ _______ the report。