作业帮It is 3 years since he joined the army.为什么用is不用has been
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It is 3 years since he joined the army.为什么用is不用has been
It is 3 years since he joined the army.为什么用is不用has been
It is 3 years since he joined the army.为什么用is不用has been
since是现在完成时的标志,但是since+过去的时间点或是过去时态从句,下面的例句是摘抄的,你参考下.我觉的,两个应该都行,你说的应该也是对的.因为joined 也是瞬时动词.
It is / has been + 一段时间 +since 从句.例如：
It is / has been three years since we saw each other last time.
我们上一次见面是在 3 年前.
It is four years since I became a student.
我上了 4 年学了.
（注意：状语从句中常用短暂性动词的一般过去时作谓语动词）
注意：since 从句里的谓语动词是瞬间动词时,表示这段时间从该动作开始时算起； since 从句里的谓语动词是延续性 / 表状态的动词时,则表示这段时间从动作结束时算起.例如：
It's five years since he lived here.
他离开这儿有 5 年了.（ live 为延续性动词）
It's ten years since he joined the army.
他参军已有 10 年了.（ join 为瞬间动词）
it is 3 years since Tom has been abroad
It is five years since he smoked
英语翻译It is 3 years since they got marriedIt is 3 years since they married求翻译.为什么都是since可意思完全不一样诶
it is 3 years since he has been a doctor 怎么翻?还有it is 3 years since he was a doctor 怎么翻译1?
It is 3 years since he joined the army.为什么用is不用has been
it is ...since ..为什么不用完成时it is 100 years since Qinghua university was found.
英语翻译是不是翻译为：it is 3 years since he has smoked.
It is years since we meet last time.（纠错）
It is three years since she was in the
It is ten years since he ____(join) the army
It is forty years since he home 改为间单句
it is years since i saw him（追加）it is years since i saw him为什么不说it is years since i has seen him而it was years since i had seen him 却可以
It is 3 years since he joined the army 和It has been 3 hours since he left his office.为什么一个用is 一个用had been
It is 3 years since he joined the army 和It has been 3 hours since he left his office.为什么一个用is一个用has been
it is two years since I came here还是it has been two years since I came here
求It is three years since he worked in his office.解释下since
It ---------five years since he left for beijing1Was 2have been 3is 4 is going to be
it's years since i