it has been since.用法
来源:学生作业帮 编辑:拍题作业网作业帮 分类:英语作业 时间:2024/04/29 10:46:34
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)
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.用法
How long has it been since.这是什麼用法 意思
it has been some time+since是什么意思
it has since been rebuilt怎么翻译
It is/has been + since sb +
造句it has been +时间段+since从句
has since been
It has been there since a t_ years ago .
it is 3 years since Tom has been abroad
用 “It has been +一段时间+since”造句两个
It has been 3 years since he came here.
It has been a month since I have seen you.