什么时候用It was+一段时间 +since,什么时候用It is +一段时间+since?

什么时候用It was+一段时间 +since,什么时候用It is +一段时间+since? 英语翻译it is/was 一段时间 +beforeit is/was 时间点 +whenit is/was 一段时间+ since 用it was+一段时间+before+一般过去时态 此类型造句 解释一下什么时候用陈述语序 How was it that he managed to get the information?什么时候用陈述 什么...解释一下什么时候用陈述语序 How was it that he managed to get the information?什么时候用陈述 什么时候不 强调句式 It is (was) 被强调部分+ that (who)+其余部分,什么时候用who,什么时候用that? It -------- five years since he left his motherland.这种句型的题,什么时候用It was,什么时候用It is啊?具体一点,举个例子啊..... It was against the law to take the money back from him.zhong wen yi si? it was that it was that 什么时候可以用,it was .when it was not until Decemeber 31 _____ we heard him A which B when Cthat Dthen 选哪个？为什么？我选的B。 什么时候用was/were+done How was the weather yesterday?回答用It was cloudy么问天气回答什么时候用动词什么时候用名词呢 it is you who made our performance so successful为什么is不用was?英语书上是is,到底什么时候用is什么时候用was啊? Therer ( ) a party every sunday.But it ( ) an interesting one last Suntary.A,is;si B,is;was C,was;is D,was;was 如何解释英文字母c的两种发音英文字母c有两种发音一种是/si：/,一种是/k/,那要怎么解释什么时候用/si：/,什么时候用/k/, 强调句式 It is 还是It was?什么时候用is什么时候用was呢?我看到这样的例子：It was my uncle that(who) sent me to the school.It is the article that we discussed last week.It is in the room that I was born 30 years ago.我暂时 for+一段时间 究竟什么时候用一般过去时,什么时候用完成时态呢?它跟since的区别? 英语高手进我要晕了it was in the restaurant (where) we enjoyed seafood last night.it was shanghai where i first met tom为什么不能用that,用强调句,到底什么时候用that什么时候用where? It was evening ______ we reached the little town of Winchester.when为什么不可以什么时候用when 什么时候用before When the castle was built,a river ran all the way round it.zhong wen yi si?