（1）可以加ing
（2）不是所有的BE动词后都一定要加ing的,是看要用在哪种时态和句形里的.
（3）是的
（4）主谓宾在一定条件下可以颠倒
（5）第二句并没有强调这件事情是发生在他身上的,只是说发生了什么事.
（6）主语是what
（7）不同的句形有不同的主语,你看是围绕着哪个中心词来讲的,哪个就是主语.
宾语从句,Do you know where he is?Do you knwo what is happening?W
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