1. Do you know what time _________?
A. the train leave B. does the train leave
C. will the train leave D. the train leaves
2. I don't know _________. Can you tell me, please
A. how the two players are old B. how old are the two players
C. the two players are how old D. how old the two players are
3. I am sure _______ you said is true.
A. what B. that C. which D. who
解析： 根据句意应用what , 做said 的内容， 你所说的话。应选A.
4.The small children don't know _________.
A. what is their stockings in B. what is in their stockings
C. where is their stockings in D. what in their stockings
5. I can't understand _____.
A. what does Christmas mean B. what Christmas does mean
C. what mean Christmas does D. what Christmas means
6.I don’t know _____ he will be back home.
A. who B. what C. when D. where
方法一：当主句谓语动词是hope， decide， wish， choose， agree， promise等，且宾语从句的主语与主句主语一致时，宾语从句可简化为不定式结构。例如：
Li Ming hopes he will be back very soon. →Li Ming hopes to be back very soon.
We decided that we would help him. →We decided to help him.
方法二：当主句谓语动词是know， learn， remember， forget， tell等动词，且主句主语与从句主语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：
She has forgotten how she can open the window. →She has forgotten how to open the window.
注：当主句谓语动词是tell， ask， show， teach等动词，且后带双宾语，从句主语和间接宾语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：
Could you tell me how I can get to the station？ →Could you tell me how to get to the station？
The headmaster ordered that we should start at once. → The headmaster ordered us to start at once.