It is +一段时间+since+从句 和 before

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• It is +一段时间+since+从句 和 before
• 问个雅思小作文的问题.However there was a little fluctuation in Beef between 1979 and 1984 when consumption declined to 170 grams in 1981 before a quick ascendant up to a peak(250 grams) in 1984.这是我写的句子,那里那个when引导的从句可以这样用吗?when引导从句时后面的从句是指那一段时间发生的事情还是那个时间点发生的事情?
• before 和after 在句里面 看主句从句
• which 和 what 在从句中的用法1.Output is now six times what it was before liberation.2.They are so alike that you can't tell which is which. 想请教一下为什么这么用?不是说what用在名词从句里,而which单独时用在形容词不是说what用在名词从句,which单独时用在形容词从句吗?第一句为什么不是‘which it was before liberation’ 来修饰times,做形容词从句?第二句为什么不是‘what is which ’做tell的宾语从句,which能做从句的主语吗?不是what才能做从句的主语吗?
• before+一段时间和一段时间+before的区别
• before 与从句 和各种句式 的各种用法
• 如何区分强调句和状语从句1如题2 It was evening(B)we reached the townA that B before C since D until3 It was with great joy (D)he received the letterA because B which C since Dthat3.It is imagination (C)makes the world more beautifulA where B what C that D when4.It was in New York ((A)Mary first met himA that B which Chow D when
• it is + 一段时间 +since 和 it is + 一段时间 + before的区别
• ____ she ____ yesterday,she would meet the famous singer today.A.if :didn't leave B.Had not :left C.Hadn't :left D.Didn't :left个人认为从句是与过去事实相反的,而主句则是与现在事实相反的,但B和C有什么区别呢?PS:If only I ____ driving before .A.learn B.learned C.had learned D.would learn 我想要说的是这句话到底是对现在虚拟还是对过去虚拟呀？个人认为是现在……
• 什么时候用现在完成时和一般现在时表将来在时间状语从句中中，一般表将来，但有时也用现在完成时，如何区分，如before引导的时状
• 如图,等边三角形ABC的顶点坐标分别为A(－2,0)、B(2,0),C(0,2倍根号3)
• 在100倍显微镜下可观察到4000个细胞均匀分布,若放大倍数换为200倍,则能看到多少细胞,如何计算