A：stop/to do sth.(停下来做某事)/doing sth.(停止做某事)
例如：
We stopped talking when the teacher came in.老师进来的时候，我们停止说话。
We stopped to have a rest after a long walk.走了很长的一段路，我们停下来息一下。
B：remember/to do sth.(记得去做某事)/doing sth.(记得做过某事)。
例如：
I remember to take the medicine at the right time.我记住要按时吃药。(还没吃)
I remember taking the medicine at the right time.我记得已按时吃过药了。(吃过了)
C:forget/to do sth.(忘记去做某事)/doing sth.(忘记做过某事)
例如：
I forgot to tell her about it.我忘了告诉她这件事。(没告诉)
I forgot sending the letter.我忘了发错信了。(已发过了)
D:try/to do sth.(试图)/doing sth.(试着干)
例如：
If you can not go to sleep, try to count from 1 to 100.
Have you ever tried cooking meat in this way?
