after,until,as soon as,while主句从句用什么时态

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after,until,as soon as,while主句从句用什么时态
after,until,as soon as,while主句从句用什么时态

after,until,as soon as,while主句从句用什么时态
after: [ 'ɑ:ftə ]
a. 以后的
ad. 以后,后来
conj. 在...以后
prep. 在...之后

例句与用法:
1. I found your coat after you had left the house.
你离开房子之后,我发现了你的外衣.

2. He grew weak in after years.
在以后的几年里,他变得衰弱了.

3. We shall arrive soon after.
我们将随后很快就到达.

4. Mr. Smith left for London after breakfast.
史密斯先生吃过早餐后就动身去伦敦了.

5. His book is the best on the subject after mine.
他的书对这一问题的论述是最好的,仅次于我的书.

until: [ ən'til, ʌn'til ]
prep.&conj. 直到...为止

例句与用法:
1. I didn't wake up until I heard the alarm clock.
直到听到闹钟的铃声我才醒来.

2. He lived in California until he was twenty.
他在加里弗尼亚一直住到20岁.

3. She was a bank clerk until the war, when she trained as a nurse.
她战前是个银行职员,战时受训当了护士.

while: [ (h)wail ]
conj. 当...的时候
n.&a. 一会儿
v. 消磨

词形变化:
动词过去式:whiled 过去分词:whiled 现在分词:whiling 第三人称单数:whiles

例句与用法:
1. I haven't seen him for a long while.
我已经很久没见到他了.

2. While Mary was writing a letter, the children were playing outside.
玛丽写信时,孩子们在外面玩耍.

3. She worked in a bank for a while before studying law.
她学法律之前在银行工作过一段时间.

4. I lived in a hostel while I was a student.
我求学期间住在青年招待所里.

视情况而定。
after一般用于一般过去时；until一般用于一般过去时或过去完成时；as soon as，while一般用于现在进行时或过去进行时。

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初中的话，那么这几个词的考点是引导时间状语从句的时候动词的时态是什么
while,强调从句和主语同时发生，主从句时态一样，但从句要用进行时
eg. they arrived home, while i was watching TV.
as soon as... 等于 the moment that/the instant that/immediately/once，强调一……就……，前后时态一样
eg. As soon as we got home, the ring rang.
until,等于till,但till不能用于居首
主语一样是将来事，从句一般是现在式
eg. I wont go with you until I finish my homework
after,和before一样
主从句时态基本一致，但因为语境也有个别情况
eg. I may be many years after We meet again

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