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?

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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?
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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?
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?

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 thirty years before we see each other this time.
since后面的时间指开始的时间(从那时候算起已经30年了)
before后面的时间指结束的时间(直到这次见面已经30年了)

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's a long time ( ) I saw you last.----Yes,and what a pity it is now that it will be a long time ( ) we see each other again.A before since B since when C since before D when before 考察的知识点是什么,since和before,when的区别when是 it is + 一段时间 +since 和 it is + 一段时间 + before的区别 it is + 一段时间 +since 和 it is + 一段时间 + before的区别 It is +一段时间+since+从句 和 beforeIt is +一段时间+since(before)+从句 since 和before 有什么区别吗 before和since的用法及区别如题. since和before的用法有什么区别呢 It be .when It be .before It be .since的区别 long before和long since 区别 it is some time before与it is some time since 的区别是什么,请举例说明, it's + a period of time + before/since 的区别?it's + a period of time + before... 与 “it's + a period of time since...”的区别是什么?什么时候用 since 什么时候用 before I had ever seen it before.和[I had never seen it before.]有什么区别? since,after,when before的区别 since、 before、 ago 他们的区别是什么 英语单选(关于since和before)How long do you suppose it is __ he arrived there?A.before B.since 两者有什么区别? it was years before i had seen her 和it wasyears since i had seen her是相等吗 since 和before 作“以前”解释时的用法和区别? 英语中since和before的用法?