be busy doing sth 忙于做某事
1 The students are busy doing their homework.
学生们正忙着做作业。
2 The boy is busy playing computer games.
这个男孩正忙着玩电脑游戏。
3 The workers are busy working.
工人们正忙着工作。
be busy doing sth 忙于做某事
1 The students are busy doing their homework.
学生们正忙着做作业。
2 The boy is busy playing computer games.
这个男孩正忙着玩电脑游戏。
3 The workers are busy working.
工人们正忙着工作。
