nobody told us后面为什么跟how to do it 或者what to do而不能跟how to do 或者what to do it

问题描述:

nobody told us后面为什么跟how to do it 或者what to do而不能跟how to do 或者what to do it

首先明白一点动词do为及物动词必须带宾语的。因为what起两层作用,作动词do的宾语。而hou没这作用,只能用it作do宾语

what to do中,what相当于do的宾语,就是to do what(something)的意思.
how to do中没有宾语,do后面要加一个宾语it