作业帮It's been +一段时间 + since +一般过去式since 不是都用于完成时吗 为什么是一般过去式
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It's been +一段时间 + since +一般过去式since 不是都用于完成时吗 为什么是一般过去式
It's been +一段时间 + since +一般过去式
since 不是都用于完成时吗 为什么是一般过去式
It's been +一段时间 + since +一般过去式since 不是都用于完成时吗 为什么是一般过去式
It's been +一段时间+since+一般过去时,是最常用的一个句型.
你说since用于现在完成时,是指since前的主句用现在完成时,如句型的It's been=It has been,就是现在完成,而since后面的从句必须用一般过去时.
把完整的句子写上来了
前半句It's been是完成时，It has been，since后接的是时间状语从句
举例说明：
1、It has been 3 years since he has lived here. 三年以来他一直住在这里。
2、It has been 3 years since he lived here. 他不住这已经三年了。
希望能帮到你
这是固定搭配，since 是自从过去那个动作开始，因此用过去式、、、
since 是引导时间状语的，有since引导的状语，句子要用现在完成时。
since+时间段+ago. since+时间点，或者since+that从句，从句用过去式。
主句是完成时呀it has been
It's been awhile.
it's been coverd..
It's been +一段时间 + since +一般过去式since 不是都用于完成时吗 为什么是一般过去式
用 “It has been +一段时间+since”造句两个
it's +一段时间+since 是什么时态
It's been a while
It's been so long
It's been a long
it's been a long
It's has been accepted
it's been是什么时态,
It's been very informative
口语中的it's been
it's always been you(It has always been
it has been可以缩写成it's been
it's been.的全称是不是 it has been...
it's seems like years since it's been
what it's been it's 又是什么的缩写?