It is…before… 算什么句型?怎么用?怎么翻译?

It is…before… 算什么句型?怎么用?怎么翻译? It is…before… 算什么句型?怎么用?怎么翻译? It is/has been…since… It was/will be…before… 这两个句It is/has been…since…It was/will be…before…这两个句型怎么用?要用什么时态? 单选 it is 30 years ____we last met.句型it is ……since 和it is~before 这两个句型怎么区分 请问it be…before…的句型用法…比如说it was 3 years before he … It's ...before...的句型 it is 句型后面应该跟什么? It is + 一段时间+since.cl It is + 一段时间+for.cl It is + 一段时间+before.cl 以及相关句型的差别? 用It is…that造句,强调句型 it is clear that… 这个句型对吗? it wouldn't be a long time before是什么意思it wouldn't be a long time before……这个句型是什么意思? 这题选C语法上错么?It was five o'clock in the afternoon ____ they arrived at the hotel.A when B before C that D since我也知道他要表达 当……时候.但是我什么情况下可以用 Is was …… that 句型?这里行么? it was 时间when it was 时间before it was 时间since 这几个句型有什么区别 It will be before long that和It is before long that有什么区别 since和before的区别!It is thirty years since we last met.这句话用before怎么说?since和before的区别到底是什么?这种It is句型什么是用since?什么时候用before? it is是什么词性用在什么句型中 it is fair 这个句型一般什么情况下用? which channel is it on?这是个什么句型?为什么?