busy后接不定式还是现在分词
1. 用作形容词时，be busy后面习惯上要接现在分词，不能接不定式。如：
She is busy gathering data. 她正忙着收集数据。
The bee are busy making honey. 蜜蜂正忙于采蜜。
He is busy getting ready for his journey. 他正忙着为旅行作准备。
Farmers were busy getting in the crops. 农民在忙着收庄稼。
I’ve been busy weeding the garden. 我一直在园子里忙着除杂草。
She was busy spinning cotton into thread. 他忙于将棉纺成纱。
She’s busy reviewing her lessons for tomorrow’s exam. 她在忙于复习功课，准备明天的考试。
2. busy用作动词时，通常用于busy oneself doing sth，其中的现在分词也不能换成不定式。如：
He busied himself (with) answering letters. 他忙于回信。
He busied himself (in) cooking the dinner. 他忙着做饭。