2025届高三英语下学期语法状语从句 学案

1.时间状语从句

When,while,as

一、when 有一些特定含义:

1.“突然，就”，常用于以下句型:

was /were doing+when….(正在做......突然间....)

was/were about to...+when...(正要做.......突然间.....)

hadn't done...+when...(还没....就突然...)

We were having a meeting when a stranger rushed in

He was about to leave when the telephone rang.

He had not fallen asleep when the teacher called him.

2.“虽然” She claimed to be 18, when I know she’s only 16.

3.“既然” Why do you walk when you have a car?

4.“本该” They were playing when they should have been working.

二、while 的几种含义和用法:

1.当......时候(进行时)

2.然而，而(并列连词)

3. 尽管，相当于 although

三、as 有“随着”、“紧接着”的含义:

1.随着As spring warms the good earth, all flowers begin to bloom.

2.紧接着As we were going out, it began to rain.

还可以表示“因为”、“正如”、“作为”等含义。

★before

1.表示“才”或“就”。

They had known each other for seven years before they got married他俩认识七年才结婚。

They had known each other for seven days before they got married.

他俩认识七天就结婚了。

1.还要很久才:It will be+时间段 +before sb.do

2.还没多久就:It won't be+时间段 +before sb.do

3.过了很久才:It was+时间段+before sb.did

4.没过多久就:It wasn't+时间段 +before sb.did

还要很久才能见到你。It will be long before I meet you

还没多久就会见到你。It won't be long before I meet you.

过了很久才见到你。It was along time before I met you.

没过多久就见到了你。It wasn't a long time before I met you.

 

★since

1.since 从句常用一般过去时，主句常用现在完成时或现在完成进行时。

Electricity has been widely used since it was discovered.

I have been looking forward to meeting you since Martin told me.

2.若 since 从句也用现在完成时，那么表示 since 从句中的动作持续到说话的时刻。

She has seldom been out since she has been ill.(尚未痊愈)She has seldom been

out since she was ill.(已经痊愈)

3.it+时间，表示“自从.....以来已经一段时间”，since 从句常用一般过去时，it 主句常用一般现在时。

It is three years since we entered the university.

★until

1.肯定句，主句谓语动词为延续性动词。

I slept and slept until mum came back.

2.否定句，主句谓语动词为瞬间性动词，意为“直到..才.”

I didn't wake up until mum came back.

3.与强调句结合时，not until不分家，即It is/was not until...that...

It is not until we are in trouble that we take measures/ steps.

★ by

1.by+ 表示现在的时间，主句用现在完成时。

We have known each other for ten years by now.

2.by+ 表示过去的时间，主句用过去完成时。

We had known each other for a decade by we graduated last year.

3.by+ 表示将来的时间(用一般现在/现完表示将来)，主句用将来完成时。

By the time we graduate, we will have known each other for a decade.

★“一...就..”

几乎为来得及..就/刚....就had hardly done...when did...

had no sooner done...than did...一...就...

注意:否定意义的词在句首须部分倒装。

Hardly had I got home when it began to rain.

No sooner had I got home than it began to rain.

Not until I lost it did l feel regretful.

★ 关于 time 的词组:

1.the first/ last/ next time,every/ each/ any time

I thought her nice and honest the first time I met her.

=I thought her nice and honest when I met her for the first time.

2. the moment/ second/ minute/ instant -...就..., the day/ week/ month/ year/ morning/afternoon

She came to the scene the moment she heard the news.

I met her the day the sun shone brilliantly.

★ once“一旦”，可以同时表示时间或条件。

Once you understand the rule, you will have no further difficulty.

Once a good beginning is made. the work is half done.

 

进阶练习

一、单项选择:

1.I felt disappointed and was about to leave,_________something occurred which attracted my attention.

A.unless             B.until              C.when              D.while

2.He was about halfway through his meal_________a familiar voice came to his ears.

A.why               B.where            C.when              D.while

3.I think he must be mad giving up the steady job_________ there isn't much chance of finding another one.

A.when              B.even if            C.though            D.but

4.—Did Jack come back early last night?—Yes.It was not yet eight o'clock_________ he arrived home.

A.before             B.when             C.that               D.until

5.How can you expect to learn anything_________you never listen?

A.in case             B.even if            C.unless             D.when

6.Generally speaking,_________according to the directions,the drug has no side effect.

A.when taking                                  B.when taken       

C.when to take                                  D.when to be taken

7._________the day went on,the weather got worse.

A.With               B.Since             C.As                D.While

8._________computers become the assignment tool of choice,educators are concerned that children will show less interest in reading books.

A.Even though        B.Till                C.As                D.Once

9.He made a mistake,but then he corrected the situation_________it got worse.

A.until              B.when              C.before             D.as

10.Someone called me up in the middle of the night,but they hung up_________I could answer the phone.

A.as                B.since              C.until               D.before

11.It was evening_________we reached the little town of Winchester.

A.that              B.until               C.since                D.before

12.---How long do you think it will be_________ China sends a manned spaceship?---Perhaps two or three years.

A.when             B.until               C.that                 D.before

13.It wasn't long_________he joined the company.

A.that              B.before              C.until                D.and

14.Several weeks had gone by_________I realized the painting,was missing.

A.as               B.before               C.since               D.when

15.I'm sorry you've been waiting so long,but it'll still be some time__________Brian gets back.

A.before            B.since                C.till                 D.after

16.The American Civil War lasted four years_________the North won in the end.

A.after             B.before               C.when               D.then

17.Scientists say it may be five or six years_________it is possible to test this medicine on human patients.

A.since             B.after                C.before              D.when

18.It is almost five years_________we saw each other last time.

A.before            B.since                C.after               D.when

19.That was really a splendid evening.It's years_________ I enjoyed myself so much.

A.when             B.that                 C.before             D.since

20.—I am going to the post office.—________ you're there,can you get me some