stop doing sth停止正在做的事

　　stop to do sth停下来去做别的事

　　The girl soon stopped crying.

　　这个女孩不久就不哭了。

　　He was tired and stopped to have a rest.

　　他很累，停下来休息一下。

　　16.forget/remember

　　forget/remember to do sth：忘记/记得去做某事(未做)

　　forget/remember doing sth：忘记/记得做过某事(做过)

　　He forgot to turn off the light.

　　他忘记关灯了。(未关)