busy doing和busy to do的含义不同、用法不同。be busy doing sth其实也可以是be busy (in) doing sth.意为忙于做某事;be busy to do sth.一般是be too busy to do sth.意为太忙了以至于不能干什么。
People are always out in their cars,watching television or busy doing something else.
人们总是驾车外出,或者看电视,再不就是忙点其他什么事情。
I am busy doing my homework right now.
我现在正忙着在做课外作业。
Was it because you were too busy doing everything else?
是因为你有很多别的事情要忙着做吗?做了很多事,意味着你很忙。
Because I was busy doing something else.
我在处理别的事。
I'm busy doing that today.
我今天在忙着做那件事情。