英语常用固定短语finish doing sth 完成某事She finished cleaning the room.be good at doing sth 擅长做某事I am good at playing basketball.go on doing sth 继续做某事,指前后做的是同一件事。The students went on talking and laughing all the way.Go on doing the other exercise after you have finished this one.be busy doing sth 忙于做某事I am busy in cleaning my room.see/hear/watch sb doing sth 听/看/观察到某人正在做某事I hear him singing.be afraid of doing sth 担心（害怕）会发生某事My little sister is afraid of staying at home alone.be interested in doing sth 对做某事的兴趣.Im interested in playing games.
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