it is time +(that)从句.这个句型中从句为什么要用一般过去时?

IT IS THE FIRST TIME THAT 句型是什么从句 It is high time that +从句,前面的如何翻译? it is the first time that是主语从句吗 It is the first time that从句做什么成分 it is/was the time that it is/was the frist time that 后接从句用什么时态? it is time +(that)从句.这个句型中从句为什么要用一般过去时? It is time that+从句时,从句动词什么时候用过去时 什么时候用should do? it is time that 从句 那这个从句到底属于是什么从句啊?如果是定语从句,那time在从句中做什么成分? IT IS TIME THAT WE LEFT 书上说这是定语从句 为什么代词是THAT而不是WHEN it is the first time that i have been to japan 是什么从句that is the first time that i have been here 是什么从句 This/It is the first/second time＋that从句,that从句谓语为什么要用现在完成时 it is the third time that you have been late this month 什么从句 it is high time that 从句中用过去式和用should+V.有什么区别 it is/was the first time +that+clause中从句用什么时态? it is high time that从句中时系词,用什么形式 主语从句it is...that 中的that it is high time that . it is high time that...是什么从句? it is a pity that...是什么从句?在网上查这两个句型,说“it is high time that...”是定语从句? “it is a pity that...”是主语从句?怎么区别的?“it is”和“that”之间不都