状语从句考查时态的替代语序的倒装以及连词的辨析

状语从句考查时态的替代语序的倒装以及连词的辨析
1.成分的省略
(1)在时间、地点、条件、让步、方式等状语从句中，如果主语是it或与主句的主语一致，且谓语动词含有be时，可把从句的主语和be一起省略。
Don't speak until (you are) spoken to.
Do come to see me whenever (it is) possible.
(2)在比较状语从句中，可省略与主句相同的部分。
I know you more than he (knows you).
Tom is two years older than Alice (is).
(3)as (尽管)引导让步状语从句倒装时，表语提前，且其前的冠词要省略。
Hero as he is, he has shortcomings.
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2.时态的替代
(1)在时间、条件和让步状语从句中须用一般现在时替代一般将来时，用一般过去时替代过去将来时。
If it rains tomorrow, we won't go fishing.
Don't get off the bus until it has stopped.
(2 )The more...the more...句型中，前句起条件状语从句作用，故用现在时表将来。
The harder you work, the greater progress you'll make.
(3)after, before, as soon as等连词本身就暗示了时间的先后，因此可用一般过去时代替过去完成时，而不会产生时间上的混乱。
I went to bed after I (had) finished my homework.
The film star (had) left before the reporter arrived.
He got down to work as soon as he (had) go to the factory.

3.语序的倒装
(1)no sooner...than..., hardly / scarcely / barely...when...句型中的主句常用过去完成时，从句常用一般过去时，且置于句首时主句要倒装。
No sooner had he got home than it began to rain.
(2)so / such...that...，not until...置于句首时主句要倒装。
So angry did she feel that she couldn't speak.
Not until he told me the truth did I realize what had happened.

4.连词的辨析。
根据上下文的语意推断属于哪种状语从句，然后选择连词。

1. I wonder why Jenny ____ us recently. We should have heard from her by now.
A. hasn’t written B. doesn’t write C. won’t write D. hadn’t written
2. My uncle ______ until he was forty –five.
A. married B. didn’t marry C. was not marrying D. would marry
3. — When will you come to see me, Dad ?
— I will go to see you when you _____ the training course.
A. will have finished B. will finish C. are finishing D. finish
4. — How long _____ at this jo b ?
— Since 1990
A. were you cmployed B. have you been employed
C. had you been employed D. will you be employed
5. With the rapid growth of pop ulation, the city _____ in all directions in the past five years.
A. spreads B. has spread C. spread D. had spread
1、A 前句中recently与事句中动词民用的语气为重要提示：We should have heard from her by now.=We haven,t heard from her by now此处讨论最近该发生而没发生的事，用现在完成时态：…hasn’t written us recently.
2、B marry是终止性动词，用在此not…until句型中表示“我叔叔直到四十五岁才结婚。”
3、D when从句中通常用一般现在时形式表将来时间。
4、B答语中的since1990是关键信息。
5、B 时间状语in the past five years与现在时间有关。