My father is very busy.我的爸爸很忙。

Jim is busy mending his bike.吉姆正在忙着修理他的脚踏车。

This is a busy main road.这是一条繁忙的主要公路。

It's the busy time for them to harvest the irfields.现在正是他们在地里收割庄稼的繁忙季节。

（1）be busy doing sth.意为“忙着做某事”

（2）be busy with sth.意为“忙于某事”，with后面通常接名词。