Stop doing something, stop doing something, do something else.

Stop doing sth.

They stopped for a cigarette. They stopped to have a cigarette.

I must give up smoking. I must give up smoking.

Typical example

She reached the top of the mountain and stopped on a big stone by the roadside.

A. have a rest.

Answer: C. Judging from the meaning of the question, she reached the top of the mountain and stopped to have a rest on a big stone by the roadside. Therefore, you should choose to "stop and do something". Stop and do another thing. " Not just the end of the climb, so stop doing something. Not correct.

Forget to do sth. (unfinished)

Forget to do sth. (completed)

The light in the office is still on. He forgot to turn it off.

The light in the office is still on, and it forgot to turn it off. (Leave the light on)

He forgot to turn off the light.

He forgot that he had turned off the light. (The light has been turned off)

Don't forget to come tomorrow.

Don't forget to come tomorrow. (The upcoming action has not yet been completed)

Typical example

The light in the office is still on.

Oh, I forgot.

A. turn it off. Turn it off.

Answer: C. It can be seen from the fact that the light is still on, that is, the action of turning off the light has not happened, so we have to forget to do something.

He said that the light had been turned off, but he forgot the fact. This doesn't fit the meaning of the question.

Remember to do sth.

Remember to do sth. Remember to do sth.

Remember to go to the post office after school.

Remember to go to the post office after school.

Don't you remember seeing this man before?

Don't you remember seeing that man before?

Regret doing sth. (unfinished)

Regret doing sth. Regret what he did. (completed)

I'm sorry to have to do this, but I have no choice.

I'm sorry I have to do this. I really have no choice.

I don't regret telling her what I think.

I don't regret telling her what I think.

Typical example

It was brave of you to raise an objection at the meeting.

-Well, now I regret it.

A. do sth. do sth.

Answer: D. Regret doing something. Sorry about what happened. Regret doing sth. Sorry about what will happen. I regret what I said, so I chose D.

Stop doing something for a long time, even forever.

Stop doing sth. Stop in a short time and will continue to do it later.

That department has never existed.

That department no longer exists.

When the teacher passed by, the girls stopped chatting for a while.

When the teacher passed by, the girls stopped to chat.

Try to do sth.

Try to do an experiment, try to do something.

You must try to be more careful.

You should be more careful.

I tried gardening, but I didn't succeed.

I tried to plant fruit trees and flowers, but I didn't succeed.

Go on doing one thing and then do another.

Keep doing, keep doing what you have done.

After he finished math, he went on to do physics.

After studying mathematics, he went on to study physics.

After finishing this exercise, continue to do another exercise.

After finishing this exercise, continue to do other exercises.

Dare to do is dare to do something, which is subjective and means "fear";

Fear of doing is worrying about the situation and results of doing it. Doing is caused objectively, which means "I am afraid, I am afraid".

She didn't dare to take another step in the grass because she was afraid of being bitten by a snake.

She was afraid of being bitten by a snake and dared not take another step in the grass.

She is afraid of waking her husband.

She is afraid of waking her husband.

She is afraid of waking her husband.

She is afraid of waking her husband.

Be interested in doing sth and want to know sth.

Being interested in doing is interested in an idea, and doing is usually an idea.

I really want to know what happened.

I really want to know what happened. (I want to know)

I'm interested in working in Switzerland. Do you have any thoughts about this?

I'm interested in working in Switzerland. Have you thought about this? (an idea)

It means to plan and think.

It means doing means.

I want to go, but my father won't let me.

I want to go, but my father won't let me.

Raising wages means increasing purchasing power.

Giving a raise means increasing purchasing power.

Start doing sth.

Start doing sth.

1) When talking about a long-term activity or starting a habit, use doing.

How old were you when you started playing the piano?

How old were you when you started playing the piano?

2) When begin and start are used in the continuous tense, the infinitive to do is used as the following verb.

I'm getting angry.

I'm getting angry.

3) When verbs such as try, intention, begin and start are followed by know, understand and realize, the infinitive to do is often used.

I'm beginning to understand the truth.

I began to understand the truth.

4) When the object is the subject

It began to melt.

Sensory verbs "see, see, observe, pay attention, see, listen, smell, taste and feel +do" indicate the completeness and authenticity of the action; +do indicates the continuity and gradualness of the action.

I saw him working in the garden yesterday.

I saw him working in the garden yesterday. (emphasize the fact that "I saw it")

I saw him working in the garden yesterday.

I saw him working in the garden yesterday.

Typical example

They know her very well. They watched her grow up since she was a child.

A. 10. d) growth

Answer: A. They watched her grow up, so they emphasized the process of growth, not the action of growth, so they used the sentence pattern of see sb do sth.

The missing boy was last seen by the river.

A. play games.

A. this question emphasizes its movements and plays by the river.