大家请看黑板。

　　I saw a bird in the tree yesterday.

　　昨天，我看到一只鸟在树上。

　　15.停止做某事

　　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）