请问it be…before…的句型用法…比如说it was 3 years before he …

请问it be…before…的句型用法…比如说it was 3 years before he … 请问before的用法句型! 请问before的用法句型! it won't be very long before .句型用法 it will be +段时间+before .句型用法 请问there be 句型与 it's 句型的区别 It's ...before...的句型 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? it is 句型与there be 句型有什么用法上的区别? it will be…before和 it was …before的区别 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? 是否有It will won't be long before的句型 it will be+时间段+before+do/does 的句型怎么翻译 here is……句型和there be句型的区别用法不都有存在的意义吗 it's +时间+since/that/when/before句型用法的差别它们分别有什么条件吗? it is/was ...that...句型的意思,用法最好再带上it is/was ...that/since/before/when...的用法,谢了! 我想知道 there be 句型的用法 There be 句型的用法 以及意思 be both 句型用法