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It be +时间段＋before...It be+ 时间点 ＋when...It has been +时间段 ＋sin

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It be +时间段＋before...It be+ 时间点 ＋when...It has been +时间段 ＋since...
It be +时间段＋before...It be+ 时间点 ＋when...It has been +时间段 ＋since...分别是什么意思及它们的用法?
It is three times years since they got married.与It is three times years since they be married在意思上有什么区别?It was three years before he came back form abord.It won't be long before we meet again.
It be +时间段＋before...It be+ 时间点 ＋when...It has been +时间段 ＋sin
1.It be +时间段＋before...过了多长时间才.：
It was two days before he knew.过了两天他才知道.
It was three years before he came back from abroad.过了三年他才从国外回来.
2.It be+ 时间点 ＋when...当.时候,时间是.：
It was six when he arrived.当他到达时,时间是6点钟.
3.It is / has been +时间段 ＋since...(往往用非延续性动词）自从……以来到现在已有多久,
做.已经多长时间了：
It is / has been five years since he died.他已经死了5年了.
4.It is three years since they got married.他们已经结婚三年了.
It is three years since they were married.他们已经离婚三年了.（若since引导的状语从句的谓语动词是持续性动词或表示状态动词的过去时时,则从句表示的时间是“从动作或状态结束时算起”.）再如:
It has been quite some time since I was last in London.我上次离开伦敦至今颇有一段时间了.
5.It won't be long before...:不久.
It won't be long before we meet again.我们不久会再见面.
It would be+时间段+before+什么时态 it is 时间段和it has been时间 区别 “It be 时间段 before...”请举例句和翻译 造句it has been +时间段+since从句 It is+时间段+since+时间点 It is+时间段+since+时间点. it is 时间段since从句和it has been时间since从句的区别 it is + 时间段 + since…和It has been+ 时间段 + since的问题 it will be+时间段+before后可以是将来时吗? it will be+时间段+before+do/does 的句型怎么翻译 It is\has been+时间段+since+一般过去式=时间段+（）+since+一般过去式 it is 时间段since从句和it has been时间since从句的区别两者可以互相转换吗,英语专业人士来.