It be+ ...since/before/when 分别在哪些情况下用?

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It be+ ...since/before/when 分别在哪些情况下用?
It be+ ...since/before/when 分别在哪些情况下用?

It be+ ...since/before/when 分别在哪些情况下用?
一before.
1.It was/will be+时间段+before... 过了…才…
eg:It was three years before he finished the work.他花了三年才完成这项工作.
It will be three years before he finishes the work.他得花三年才能完成这项工作.
2.It won't be/take long before...不久就会…
eg:It won't be long before he finishes the work.他不久就会完成这项工作.
二since.
1.It is/has been+时间段+since...自从…以来,过了…
eg:It is/has been three years since he finished the work.自从他完成这项工作已经三年了.
2.该句型中若since后跟延续性动词,要翻译成否定含义,即“没做某事已经多久了”.
eg:It has been three years since he worked here.他不在这工作已经三年了.
It has been three years since he smoked.他已经戒烟三年了.
3.若主句非It is…形式,则主句还可用过去完成时.
eg:He had been worrying since the letter arrived.自从接到那封信后他就一直焦虑不安.
三when.
when没有固定与It is…连用的句型.when可表示时间点或时间段,因此从句中短暂性动词或延续性动词均可用.when还可作并列连词,表示突然发生一个动作,等于and at that time.常用句型:
1主语+was/were doing when...
2主语+was/were about to do when...
3主语+had/hadn't done for some time when...
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英译中5句:— We can give you a ride into town1— We can give you a ride into town— Oh,that would be great.Thank you.2— Haven't seen you for ages!Do you still work in Guangzhou?—No,I don't.It's two years since I worked there.3As never befo It be .when It be .before It be .since的区别 It (be)five years since I (ride)a bike. It---------- (be) four years since I moved here. 什么时候用It be some time+since从句,什么时候用It be some time +that 从句 It will be five years since we meet again.为什么用will be 还有when? 英语长句分析：什么句型,主干是什么,修饰成分有哪些,充当什么成分,尽量详细一点,He felt weak and sore,and the pain of his smashed knuckles warned him that,even if he could find a job at navvy work,it would be a week befo It _____(be)more than three years since jim___(leave)here怎么填 It has been ten years since I ___(be) a teacher. It ___(be)one and a half years since I __(begin) to study English. It will be about three weeks____he cones back.A.after B.until C.since D.before It _(be)five years since we last saw each other. It be+ ...since/before/when 分别在哪些情况下用? It __is_________(be) three years since Lily joined the Green.为什么不是 has been it will be a long time__peter__his work.A since,has finished Bafter,finished It __ (be) five years since I ______ (come)to the country填什么 it _____(be) three years since my borther went to Hainan.(适当形式填空） It _（be) two years since he left school.答案上是is,但是为什么呢?