2. be busy doing/with sth 忙于做某事（常考）
e.g: I was busy washing my car at that time. 那时候我正忙于清洗我的车子。
I am busy with my work.
3. be coming/going/leaving/fiying/moving/dying（某些位移动词用进行时态时表将来）
the bus is coming/the dog is dying.
4. be excited to do sth 对做……感到兴奋
Jacky was excited to travel there by plane.
be excited at sth
Lily was excited at his words.
be excited about doing sth
