= seconds/minutes/moments/moments …

He came to see me as soon as he checked into the hotel.

He came to see me as soon as he checked into the hotel.

They informed us as soon as they got the news.

They informed us as soon as they got the news.

The police rushed to the scene as soon as they heard the accident. The police rushed to the scene as soon as they heard about the accident.

2 ... before ...

(1). Before ... Just ...

Before he could rush into the room to save his children, the roof collapsed.

Before he could rush into the room to save the child, the roof collapsed.

He ran away before I could stop him.

To my great disappointment, my favorite singer left the concert before I could have a word with him.

(2) How long will it take and how far will the action go?

They walked about 30 miles to the west before they saw a village.

They worked around the clock for about three days before they returned to normal.

Unconsciously, three years have passed.

3. Yes+time period+before ... How long did it take ...;

Before long ... Soon ...

Will (not) be+time period+before … how long (soon) … before … ..

He soon realized the danger of this position.

It was three years before he came back.

You will graduate from this school in half a year.

4. Once ... Immediately ... Than ... = Hardy ... When ... Just ... Just. ...

Faster than /when+ simple past tense/hardly+past perfect tense.

If hardly is at the beginning of the sentence, the main sentence should be inverted.

Hardly had he sat down to rest when the doorbell rang and Allen came in.

Hardly had he got off the train when his daughter ran towards him.

Hardly had we arrived when she cried to go home.

Once and for all ... indicate the time and conditions.

Once you understand this rule, you won't have any more difficulties.

Once you decide to do something, you should do it well.

Once you enter the chemistry laboratory, you should follow the teacher's instructions.

6. Because ...

Self-directed clauses, whether continuous verbs or discontinuous verbs, indicate the completion or end of an action or state.

Pay attention to sentence translation:

I haven't heard from him because he lives in Nanjing. (= Since he left Nanjing ...)

I haven't heard from him since he left Nanjing.

She has kept in touch with her former friends since she was in Yangzhou. (Since she left Yangzhou ...)

She has kept in touch with her former friends since she left Yangzhou.

Contrast:

1). I have never seen him since he was ill.

I haven't seen him since he was ill.

I have never seen him since he was ill.

I haven't seen him since he was ill.

Yes/(always)+time period+self+past tense

It has been two years since his father died.

His father has been dead for two years. His father died two years ago.

His father has been dead for two years.

It has been 8 years since I graduated from college.

I graduated from college eight years ago.

He has given up smoking for three years. He hasn't smoked for three years. The clause verb is not continuous, and it is translated into positive meaning. )

It has been three years since he left school. -He has graduated for three years.

Seven ... until ... until ... no ... until ... until. ...

You will stay here until your mother comes back.

The meeting was put off until ten o'clock.

It was not until we watched the Earth Day program on TV that we learned more about global warming.

We didn't know about global warming until we watched the Earth Day program.

It was not until we watched the Earth Day program on TV that we learned more about global warming.

It was not until he failed in the exam that he realized that he had wasted a lot of time playing computer games.

8 ... when ... leads to the coordinate clause, "At that time, suddenly", emphasizing the sudden occurrence of another action.

One day, Chuck was flying across the Pacific Ocean when his plane crashed. Chuck survived and landed on a desert island.

I was walking along the river when I heard a drowning boy calling for help.

I was about to leave when it began to rain.

I was walking along the street when I suddenly saw a shop.

I'm walking along the street. Just then, I saw a tailor's shop.

9. Although, although

Although I admit that the problem is difficult, I don't think it can't be solved.

Although I admit his advantages, I can also see his shortcomings.

I didn't lose my temper when I was angry with her.

10. adverbial of place

You should put the book back.

Persevering people start their success where others fail.

Where there is a will, there is a way.

Where people are greedy, there will be no peace.

Go where you should go and continue your study.