疑问词（when/where/how/who/whom/whose/what/which）和 whether接 to do， 此结构可以表达出should（应该）或can/could（能够）。
I don't know what I should do.
I don't know what to do.
Please tell me how I can get to the bus station.
Please tell me how to get to the bus station.
Jim told us where we could find it.
Jim told us where to find it.
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亲。（）the Internet and you will get more information. 括号内应该用search的什么形式。和解释。谢谢。