8.1 stop doing/to do
stop to do 停止，中断做某事后去做另一件事，stop doing 停止做某事。例如：
They stop to smoke a cigarette.
I must stop smoking.
8.2 forget doing/to do
forget to do 忘记要去做某事
forget doing 忘记做过某事。例如：
The light in the office is stil on. He forgot to turn it off.
He forgot turning the light off.
8.3 remember doing/to do
remember to do 记得去做某事，remember doing
Remember to go to the post office after school.
Don't you remember seeing the man before?
8.4 regret doing/to do
regret to do 对将要做的事遗憾，regret doing
I regret to have to do this, but I have no choice.
I don't regret telling her what I thought.
8.5 cease doing/to do
cease to do 长时间，甚至永远停做某事
cease doing 短时停止做某事，以后还会接着做。例如：
That department has ceased to exist forever.
The girls ceased chatting for a moment when their teacher passed by.
8.6 try doing/to do
try to do 努力，企图做某事
try doing 试验，试着做某事。例如：
You must try to be more careful.
I tried gardening but didn't succeed.
8.7 go on doing/to do
go on to do 做了一件事后，接着做另一件事，go on doing
After he had finished his maths，he went on to do his physics.
Go on doing the other exercise after you have finished this one.
8.8 be afraid doing/to do
be afraid to do 不敢，胆怯去做某事，是主观上的原因不去做，意为"怕"，be afraid of doing 担心出现doing的状况、结果。doing 是客观上造成的，意为"生怕，恐怕"。例如：
She was afraid to step further in grass because she was afraid of being bitten by a snake.
She was afraid to wake her husband. 她不敢去叫醒她丈夫。
She was afraid of waking her husband. 她生怕吵醒她丈夫。
8.9 be interested doing/to do
interested to do 对做某事感兴趣，想了解某事
interested in doing 对某种想法感兴趣
I shall be interested to know what happens.
I'm interested in working in Switzerland. Do you have any idea about that?
8.10 mean to doing/to do
mean to do 打算、想，mean doing 意味着。例如：
I mean to go, but my father would not allow me to. 我想去，但是我父亲不肯让我去。
To raise wage means increasing purchasing power. 增加工资意味着增加购买力。
8.11 begin（start） doing/to do
begin / start to do sth /begin / start doing sth.
How old were you when you first started playing the piano? 你几岁时开始弹钢琴？
2）begin, start用进行时时，后面动词用不定式to do。例如：
I was beginning to get angry。我开始生起气来。
3）在attempt, intend, begin, start 后接know, understand, realize这类动词时，常用不定式to do。例如：
I begin to understand the truth。我开始明白真相。
The snow began to melt.雪开始融化了
8.12 感官动词 + doing/to do
感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do表示动作的完整性，+doing 表示动作的进行性。例如：
I saw him work in the garden yesterday.
I saw him working in the garden yesterday.