时间状语从句。
在句子中起时间状语作用的句子称为时间状语从句，可放在句首，句中或句末。
常用引导词有：
when, while, as(当。的时候；一边) after在。之后 before 在。
之前 since自从 ever since 自从 till 直到 until 直到 as soon as 一。就。once一。
就 whenever every time每次 each time每次 next time下次 the moment一。就一。就。
the time...by the time 到。时候 hardly...
when...一。就。
directly...一。就 immediately一。
就 instantly一。就 no sooner...than 一。
就。while, as的用法。
when & as引导的从句中的动词既可以是延续性的，也可以是终止性的，while所引导的从句，动词只能是延续性的。
when the fire broke out, all the students were sleeping soundly.
the telephone rang while i was taking a bath.
--are you ready for spain?
--yes,i want the girls to experience that while they are young.
when 还可以作并列连词，翻译为“这时，那时” 相当于：at this/that time. 常用句式为：
somebody was doing sth. when...
somebody was about to do/going to do/ on the point of doing sth. when...
somebody had just done sth. when...
we were h**ing a meeting when someone broke in.
we were about to set off on our way, when it suddenly began to rain.
i had just arrived home when my friend dropped in on me.
while“在。期间；而；尽管”
please don't talk so loud while others are working.
he likes pop music,while i am fond of folk music.
while i admit that there are problems, i don't agree that they connot be solved.
father was cooking while i was doing my homework.
as一边。一边。随着。
he hurried home, looking behind as he went.
they talked as they walked along the river.
as time goes on, it's getting warmer and warmer.
as you grow older, you will know better and better about yourself.
soon as/ immediately/ directly/instantly/the moment/the minute//the instant/so sooner...than...hardly(scarcely/barely)..
这些从属连词引导的从句都表示从句的动作一发生，主句的动作随即就发生，常译为：一。就。
i will call you as soon as i get home.
the moment i heard the voice, i knew father was coming.
the boy burst into tears immediately he saw his mother.
注意：no sooner...than...hardly...when...的时态搭配：
no sooner/hardly引导的句子谓语动词应用过去完成时， 而than/when引导的句子谓语动词用一般过去时，此外当把no sooner和hardly提前的时候，句子要倒装。
i had hardly got home when it began to rain.
hardly had i got home when it began to rain.
i had no sooner seem him than i asked him about the matter.
no sooner had i seem him than i asked him about the matter.
until 和 not...until
肯定句中：主句谓语动词是延续性动词，主从句都是肯定的，表示“一直到。为止”
he remained there until she arrived.
she waited with me until/till the train arrived.
否定句中：主句谓语动词是延续性动词，从句为肯定的，表示“直到。才。
he won't go to bed till/until she returns.
she didn't go to bed until 24:00.
until可以放在句首 till不可以。
not...until句型中的强调和倒装。
it was not until you tole me that i had any idea of it.
it was not until 8:00 we begin our class every day.
not until you told me did i h**e any idea of it.
not until all the fish had died,did the farmers realize how serious the pollution was.
在。之前， 还没来得及。就之后才。
it was some time before we realized the truth.
we had sailed four days and four nights before we saw land.
we hadn't run a mile before he felt tired.
before i could get in a word,he had measured me.
someone called me up in the middle of the night,but they hung up before i could answer the phone.
before they reached the station, the train had gone.
句型：it will be +时间段+before 多久之后才。
it will be a long time before china becomes a developed country.
it will not be long before we meet again.
自从。以来主句用现在完成时/完成进行时，从句用一般过去时。
great changes h**e taken place since you left the country.
he has been working in this factory since he left school.
句型：it has been/is +时间段+since从句（时态用一般过去时)
it has been ten years since i moved here.
**since还有"既然"的意思。
since we're young we shouldn't be afraid of ****** mistakes.
名词短语引导的时间状语从句：
the time, the moment, the minute, the day, the year, the first time, the second time, by the time, each time, every time, next time, any time,etc.
这些词前面不加介词，后面不加when
the day he returned home, his father was already dead.
next time you come, do remember to bring your son here.
i recognized him the minute i saw him.
句子口译：知道你告诉我，我才知道这件事。
听到闹钟的铃声我才醒来。
我定居美国以来回过两次家。
从他失踪到现在已经二十年了。
自结婚以来他们一直过得很幸福。
我必须在回家前写完这封信。
我还没来得及告诉他真相，他就死了。
我已收到他的信就去看他了。
地点状语从句。
引导地点状语从句的连词有：where wherever
we should go where the party needs us most.
you are free to go wherever you like.
地点状语从句与定语从句的转换：
只要在引导词where和wherever前加上to/in/from the place或to/in from any place就可以了。
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