作业帮it has been since.用法
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it has been since.用法
it has been since.用法
it has been since.用法
It is + 段时间 + since.../ It has been + 段时间 + since...表示“从……起已有多长时间了”.两句型意思相同,前者是规范说法,后者是口语说法.
用法：since从句中常用一般过去时,若从句中是持续性动词的一般过去时,则表示该动作结束有多长时间了.如：
It is three years since he smoked.他不吸烟已有3年了.
试比较：
It is three years since he began to smoke.
t is three years since he has smoked.两句均意为：他吸烟已有3年了.
注意：在这种结构中,since引导的从句绝对不能用否定式的谓语动词来表示否定意义,试比较：
他好久没学汉语了.
误：It is a long time since be didn’t study Chinese.
正：It’s a long time since he studied Chinese.
(studied为持续性动词,应从其动作结束时算起)
It has been since +从句，从句用一般现在时。相当于It is +段时间 since+从句。
It has been ten years since he came here.
I t is ten years since he came here.
it has been since.用法
How long has it been since.这是什麼用法 意思
since的用法 it+is+一段时间+since+从句为什么这里is可以换成has been但不能换成was
it has since been rebuilt怎么翻译
造句it has been +时间段+since从句it has been +时间段+since从句
it is + 时间段 + since…和It has been+ 时间段 + since的问题两者有何区别吗?从用法上和翻译上说明谢谢
has since been
It has been 4 years since I smoked.怎么翻译?
It has been 3 years since he came here.
用 “It has been +一段时间+since”造句两个
It is/has been + since sb + 具体,简洁.
It has been there since a t_ years ago .
It is/has been+since sb+did 怎么用?
It is a week since he has been to BeiJing.
it is 3 years since Tom has been abroad
为啥it is some time since与it has been some time since没区别
It's a long time since还是It has been a long time since
it is some time since+...与it has been some time since+...什么区别?