高中英语真题-时间状语从句和让步状语从句.doc

时间状语从句和让步状语从句

【归纳】

▼时间状语从句

????1.?when，while，as

????(1)?when引导时间状语从句时表示“当……的时候”，强调“特定时间”，从句中既可

用延续性动词也可用非延续性动词。如：?

I’ll?call?you?when?I?get?there.?

When?the?wind?blows,?all?the?doors?rattle.?

When?I?came?home,?my?wife?was?cooking?dinner.?

(2)?while引导时间状语从句时表示“在……期间”，其所表示的时间不是一点，而是一段，它强调主句的动作与从句的动作同时持续地进行，此时从句和主句中的谓语动词都必须是延续性动词；有时也可表示主句的动作发生在从句动作的进行过程中，此时主句中的谓语动词通常是非延续性动词。如：?

Study?while?you?study;?play?while?you?play.?

I?met?her?while?I?was?at?school.?

(3)as引导时间状语从句时表示?“当……时，?一边……一边……”，?侧重强调“同一时间”或“一前一后”，表示两个动作同时发生（包括一个主语同时进行两个动作），?或者一种动作随着另一种动作的变化而变化。如：

He?jumps?as?he?goes?along.?

As?the?wind?rose?the?noise?increased.?

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

2.?until?/?till?

在肯定句中表示“做某事直至某时”，主句动词必须是延续性的。在否定句中表示“直至某时才做某事”,?主句动词可以是延续性的也可以是非延续性的。如：

肯定句：Wait?till?I?call?you.?

否定句：She?didn’t?arrive?until?the?show?began.?

3.?表示“一……就……”的结构：

as?soon?as和hardly?...?when,?no?sooner?...?than都可以表示“一……就……”。如：

As?soon?as?I?got?home,?it?began?to?rain.?=?I?had?hardly?got?home?when?it?began?to?rain.?=?I?had?no?sooner?got?home?than?it?began?to?rain.?

4.?since?/?ever?since

since?/?ever?since表示“自从……以来”，当since?/?ever?since引导时间状语从句时，主句多用现在完成时或现在完成进行时。如：

They?have?been?friends?ever?since?they?were?in?primary?school.?

What?have?you?been?doing?since?I?last?saw?you??

5.?引导时间状语从句的单词或短语还有：directly,?immediately,?after,?before,?the?moment,?by?the?time等。如：

Immediately?he?arrived,?he?started?telling?us?what?to?do.?

Soon?after?we?joined?the?motorway,?the?car?started?to?make?a?strange?noise.

Before?we?make?a?decision,?does?anyone?want?to?say?anything?else?

He?said?he’d?phone?you?the?moment?he?got?home.

By?the?time?you?get?there?the?meeting?will?be?over.

▼让步状语从句??

1.?though,?although,?even?though,?even?if?都可表示“即使，虽然，尽管”，引导让步状语从句，?主句中不用but，但可用yet?/?still等。如：

Though?he?is?very?old,?yet?he?works?very?hard.?

Even?though?he?left?school?at?16,?he?still?managed?to?become?Prime?Minister.

2.?as和though都表示“尽管”，引导让步状语从句时必须用倒装，即将形容词、副词、名词或实义动词提到句首。如：

Poor?as?he?is,?he?is?happy.?

Exhausted?th