1. Stop to do 停止，中断做某事后去做另一件事
Stop doing 停止正在做的某事
They stopped to smoke a cigarette.
I must stop smoking.
2. Forget to do 忘记要去做
Forget doing 忘记做过某事
The light in the office is still on. He forgot to turn it off.
He forgot turning the light off.
3. remember to do 记着去做某事
Remember doing 记着做过某事
Remember to go to the post office after school.
Don’t you remember seeing the man before?
4. try to do 设法或努力去做某事
Try doing 尝试着做某事
You must try to be more careful.
I tried gardening but didn’t succeed.
5. regret to do 对要做的事情遗憾
Regret doing 对做过的事情遗憾，后悔
I regret to have to do this, but I have no choice.
I don’t regret telling her what I thought.
6. mean to do 打算，想
Mean doing 意味着
I mean to go, but my father would not allow me to.
Doing that means wasting time.
7. go on to do 放下手中的活，继续去做别的活
Go on doing 继续做原来做的活
We had supper and went on to watch TV.
He didn’t have a rest and went on working.
8. be afraid to do 不敢，胆怯去做某事，主观原因不去做意为“怕”
Be afraid doing 担心出现doing 所指的状况，结果，doing 是客观造成的结果，意为“生怕”“恐怕”
She was afraid to wake her husband up.
She was afraid of waking her husband.