since before ,since ago 语法解析1 请问 在现在完成时态里面 since 5 years before ,since 5 years ago 那个对?还是都正确,讲解下.2 写个句子The air conditioner was turned on 5 hours ago.The air conditioner has been turned on si
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since
可以说since many years before
英语中since和before的用法?
But then /Before then / Since then/ Until
long before和long since 区别
since,after,when before的区别
since和before哪个前后时态一致?
ever since/before/after区别是什么?
before,yet,since一般接什么时态
before,yet,since一般接什么时态
since、 before、 ago 他们的区别是什么
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
since before until 的用法!since before until ,not until的用法!
it is ...since it was...before 一定是过去式吗?
谈since,for,ever,already,yet,just,before的用法?
before和since的用法及区别如题.
since和before的用法有什么区别呢
请问before long与since then的区别