be busy at和別的介詞的區別

確實有 be busy at... ...

忙於做某事：be busy at (with，about，over，doing) sth 都可以。

如：媽媽整天忙於做家務。可以說：My mum is busy at housework all day.

這個句子中at可以用括號裡的詞替換

be busy in doing sth（正忙於做某事），一般將in省略了，就寫成be busy doing sth了

沒見過be busy on或者at的，只有be busy with sth，意思和be busy in doing sth一樣，如：

1、be busy with sth

例如:I am busy with my homework!

2、be busy in doing sth

例如:I am busy in doing my homework