时间状语从句引导词的区分（要点表示一...就）

今天接着讲完引导时间状语的连词，再做几道相关高考真题。

1. 表示“一...就”引导时间状语的连词各有什么特点

1）once 一旦…就，表示以现在时间为起点，将来的情况。从句通常用一般现在时代替一般 将来时，也叫“主将从现”。

<Once you know the rules>, you'll have choice to obey them.

2）as soon as 一…就…，表示以现在时间为起点，过去或将来的情况。从句通常用一般过去时或用一般现在时代替一般将来时。

I will phone you <as soon as I come back>. 用一般现在时代替一般将来时

<As soon as she entered the room>, she knew there was something wrong. 从句用一般过去时

3) hardly/scarcely…when, no sooner…than 刚一…就, 表示以过去时间为起点，过去的情况。从句通常用一般过去时，主句用过去完成时。

Hardly/scarcely had I entered the gate <when the bell rang>.

No sooner had I come home <than it began to rain>.

4）因为否定词hardly/scarcely, no sooner句置于首，主句主谓要倒装。

Hardly/scarcely had I entered the gate <when the bell rang>. = I had hardly/scarcely entered the gate <when the bell rang>.

No sooner had I come home <than it began to rain>. = I had no sooner come home <than it began to rain>.

5) 有的考生还会因记不住哪个搭配是when，哪个搭配是than而烦恼，记住no sooner是比较级，比较级与than搭配就OK了。

5. since表示“从…以来”的时间起点。

1）如果since从句的动作是短暂动词，则时间从开始算起。

It is five years <since he began to smoke>. 他吸烟五年了。

=He has smoked for five years. it is 段时间 since是现在完成时的另一种表达句式

2）如果since从句的动作是持续动词，则时间从结束算起。

It is five years <since he smoked>. 他戒烟五年了。

=He hasn’t smoked for five years.

6. whenever比when语气更强。

<Whenever you meet any trouble>, tell me at once. 无论何时

<When you meet any trouble>, tell me at once. 当...的时候

相关高考真题：

1.（2011 广东）My friends walked me to the bus stop and waited with me

<17.__until__ the bus arrived>. 主句谓语walked和waited都是持续动词，句意符合“直到...才”的逻辑。

2. （2011 江西）29. Please call my secretary to arrange a meeting this afternoon, or < whenever > it is convenient to you. 无论什么你方便的时候

3. （2011 浙江）4. One Friday, we were packing to leave for a weekend away <when my daughter heard cries for help>. 主句谓语是过去进行时，从句有“这时”的意思。

4. （2011 四川）6. As it is reported, it is 100 years since Qing Hua University was founded. it is 段时间 since是现在完成时的另一种表达句式。

5. （2011 辽宁）25. He had no sooner finished his speech than the students started cheering. no sooner是比较级，与than搭配。