Question

be busy doing和too busy doing的区别是什么？

Answer 1

区别：
be busy to do sth.(一般没有这个语法，只能说too busy doing sth,太忙以至于无法做某事)和be busy doing的意思正好相反。
1)too busy doing sth,太忙以至于无法做某事
Indemittedly, most of the time you will be too busy doing things to be aware of justhow potent a period March and the months to come truly are for you.
事实上，你忙于各种事物而没有意识到三月对你来说多么有利，以及接下来的几个月为你准备的。
Responses to questionnaires revealed that art students were younger [ and] morelikely to be active than science students ( who, presumably were too busy doing
homework to get out and get busy).
从调查问卷的回答显示：文科学生比理工科学生（可能他们更专心忙于做研究而不能分身）更早的有了体验以及更为主动。

2、 be busy doing sth
忙于做某事
The conviction of the parent was that I should be busy doing more important thingsrather than finding fault with an adolescent's vocabulary.
这名家长唯一确定的事情就是：我应该忙着做一些更重要的事情，而不是找一个未成年人用语方面的岔。
Since then, however, my husband started to be busy in doing his work so that hehad hardly had enough time to talk with my son.
然而之后，先生开始忙于工作，几乎没有时间好儿子聊聊。