How to play Table Tennis，简单地说就是带有疑问词的动词不定式。短语相当于名词。
1. 短语的含义：
如何打乒乓球。
可以换成how引导的名词性从句。
2. 用法：
how to do的用法和动词不定式的用法一样，只是表达如何去做某事，而不是去做某事。
可以作主语、表语、宾语。
举例说明：
I don't know how to play table tennis well.
=I don't know how I can play table tennis well.
我不知道如何打好乒乓球。
Kate doesn't know how to learn English well.
=Kate doesn't know how she can learn English well.
凯特不知道怎么才能学好英语。
They had learned how to learn.
=They had learned how they could learn.
他们学会了如何学习。
Rather, they remember how to find it.
=Rather, they remember how they find it.
相反，他们记得怎样找到它。
to play是不定式的结构，疑问词+不定式是对句子的省略。
一、“疑问词+不定式动词”结构的几种功用:
1)作主语
Where to go is still a question、到哪里去还就是个问题。(作主语时,谓语动词常用单数形式)
When to hold the meeting has not yet been decided、
Choosing what to eat is no longer as easy as it once was、选择吃什么,已经不像以前那么、、、
When to start has not been decided、何时动身尚未决定。
What to read is an important question、该读些什么就是一个很重要的问题。
How to begin is more difficult than where to stop、如何开始比到哪里停止还困难。
2)作宾语(作用相当于名词性从句)
A、用作动词宾语
He asked how to open the box、她询问如何打开盒子。
She couldn’t think what to say、她想不出说什么。
He could not tell whom to trust、
Our teacher explained how to use the word processor、老师向我们说明如何使用文字处理机。
Iknow where to find the boy、我知道到哪里能找到这个男孩。(作动词know的宾语)
B、作于间接宾语后作直接宾语
I’ll show you how to do it、我将给您讲这怎么做。
She kindly advised me what to do、她好心的劝告我该做什么。
My sister taught me how to fold paper into a crane、我姐姐教我如何折纸鹤。
C、用作介词宾语
Ihave no idea of how to do it、我不知道如何做此事。
Bill said something to her about what to do、比尔给她讲了讲应当怎样做。
Ifound a book on how to avoid having a heart attack、我找到一本书谈如何避免心脏病复发。
We must first solve the problem of whom to serve、、、、、为谁服务的问题。(作介词of的宾语)
3)作表语
The question is how to learn English well、问题就是怎样学好英语。(作表语)
The problem is where to find the financial aid、
The question is what to do next、问题就是下一步怎么办。
The question is how to carry out the plan、问题就是怎样执行这个计划。