before until since分别前后用于什么时态是否和when的用法相似

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before until since分别前后用于什么时态是否和when的用法相似
before until since分别前后用于什么时态
是否和when的用法相似

before until since分别前后用于什么时态是否和when的用法相似
三个词引导时间状语从句时我区别.
before ,until 这两个词用一般现在时表示将来时.如
I will wait here until he comes back.
It will be two years before he returns.
当主句是过去时的时候从句也用过去时.如
Yesterday I waited until he came back.
He glanced at the watch before he left.
since 有它自己的用法,既它的从句用一般过去时,主句用现在完成时.
I have worked here since I came here two years ago.

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不一样。
before有三种
一种是引导状语从句，要满足主将从现，如I'll go home before my mom calls me
一种是现在完成时标志，如I have been to China twice before.这时before在句尾
一种是过去完成的标志,即before+过去时间点+主句，如, before I came to Jinan,She had already done that.
until的用法同before的第一种和第三种，不过翻译不同。
since后加过去时间点或从句，从句要求是一般过去时，且since是现在完成标志，如I have been lived here since 2000或I have been lived here since ten years ago。since可以和for互换，如I have been lived here since ten years ago就等于I have been lived here for ten years.since的翻译是“自....以来”

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.时间状语：yet,already,just,never,ever,so far,by now,since+时间点，for+时间段，recently, lately, in the past few years, etc. 现在完成时，基本结构：主语+have/has +p.p（过去分词）+其他
时间状语：since+时间点，for+时间段等.现在完成进行时
时间状语：Before...

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since before until 的用法!since before until ,not until的用法! before until since分别前后用于什么时态是否和when的用法相似 But then /Before then / Since then/ Until 带选项 even though . never until . only before . ever since 1.It was some time___we realized the truthA.when B.until C.since D.before I‘ll wait for you _____ you returnA.until B.before C.after D.since It will be about three weeks____he cones back.A.after B.until C.since D.before never until,only before,ever since这些词组是什么意思,请翻译一下, he left immediately _____I could explain myself.A.as B.since C.until D.before 英语翻译请分别用till until after before 翻译 for yet ago before since分别用于什么时态 He didn’t tell me anything ______he left.A.until B.before C.after D.since并回答提问的问题(连词before与not...until的区别) until since 区别 It is ten years 是before还是since还是until he come back麻烦帮我讲下before.since,until在这种句子中的区别那如果前面是过去式用什么？如果是完成时用什么呢？英语表时间介词用法像after,from,before,by,since,for,until这些介词怎么用啊, until、after、before和since的区别、用法和意思谢谢每一个回答我的问题的人 It was evening___we teached the little town of winchesterA.that B.until C.since D.before 为什么选D it was evening we reached the little town of winchester A.that B.until C.since D.before