状语从句中“when while as soon as before”等引导词的区分.

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• 状语从句中“when while as soon as before”等引导词的区分.
• 英语的从句,while用法.1.我上英语课时,老师说：在when,while,as等引导词引导的时间状语从句中,如果主句主语和从句主语都发生在过去,持续性动词用过去进行时,短暂性动词用一般过去时.但我今天发现一道题目说,while只能引导延续性动词.请问这个怎么理解啊 2.当定语从句的从句中,缺少的是状语时,怎么区分这是定语从句还是同位语从句啊,比如说Life is a long race where we compete with others to go beyond ourselves中和I still remember the day when I first came to Beijing.为什么不能看成同位语从句,而用that引导啊.
• 英文表示当什么什么时,除了when, while 等词引导时间状语从句外,还有没有其他的词或短语可以表示此意如：电厂内所有设备正常运行时,...我不想写when all the devices of the plant operate normally,
• you post this leter for me____________?(如果你路过邮箱的话)you are passing a postbox.为什么不能填if you pass a postbox.在当连词when,as soon as,before,until,if等引导的表示未来行为的时间或条件状语从句中,不是可以用一般现在是替将来时吗?句中不是用if引导的吗,而且表示将来的动作或行为,为什么不能用一般现在时呢?
• as soon as,when,while,before,after,until引导的时间状语从句的用法
• 如何判定When\while\before等词在句中是作从属连词还是并列连词?我突然有些迷糊了,不知道怎么判断此句子是状从还是并列句,因为在不同句子里它们的意思也不同.
• 宾语从句特殊引导词的确定在宾语从句中,一般使用that/which,但是也有特殊引导词,比如有when,where等,看主语是不是作状语,如果假如是表示地点状语的就用where引导,作时间状语的就用when.我记得是这样.但是如何判断他是状语呢?
• 状语从句中“when while as soon as before”等引导词的区分.
• She_____her hairstyle in her hometown before she came to chongqing for a better job.A had changed B changed C has changed D was changing再答：由于change her hairstyle这一动作早于came to Chongqing,故可以用过去完成时态(表示过去的过去).关于过去完成构成为：had +v.(p.p.) 1)表示先于过去即到过去某一时间为止已经完成或结束的动作或状态,表示“过去的过去”,只有和过去某时或动作相比较时才可用,句中常用by,before或when等词引导时间状语从句或状语从句.如：By the end of last year we had built fire new buildings.2)表示持续到过去某一时间的动作或状态,句中常和for,since,until等短语或从句连用,如：It had snowed for a week
• when,while ,until,till ,as soon as ,as ,after ,before,引导的时间状语从句的用法
• when while before after as soon as until填空1)I am going to visit my uncle.I'll stay with him______ 7th May2)there're usually picnic or activities ________the parade on Independence Day3)they were waving flags _______the bands went down the streets4)what were they doing _______you arrived last night?5)friends usually get together on New Year's Eve --the night_______New Year's Day6)People usually set off fireworks _________it gets dark.用when，while before
• in + 一段时间 after +一段时间 after+时间点 到底都用在什么时态里怎么咋说的都有呢