忙于做某事用英语如何说

be busy doing something.例句如下:I am busy cooking.我忙着做饭。

she is busy studying.她忙着学习。

they are busy singing.她们忙着唱歌。

we are busy traveling.我们忙着旅游。

children are busy playing.孩子们忙着玩耍。

what are you busy doing?你们忙什么？。