Never once has the old couple quarrelled with each other since they were married 40 years ago.为什么助动词用has不用have,而且后面都是they啊,此时的couple应该表示两个人吧,

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Never once has the old couple quarrelled with each other since they were married 40 years ago.
为什么助动词用has不用have,而且后面都是they啊,此时的couple应该表示两个人吧,

这里的主语是the old couple 用have 也是正确的哦·
1） couple表示“夫妇”“夫妻”且用作主语时,谓语动词可用单数（视为整体,尤其是当有each,every,only one等修饰时）或复数（考虑其个体）.如：
The couple were married last week.这一对夫妇是上星期结的婚.
Each couple was asked to complete a form.要求每对夫妇填一张表.
2）有时语境上不明确强调个体还是整体,则用单数或复数均可：
The couple is [are] spending its [their] honeymoon.这对新婚夫妻在度蜜月.
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那对夫妻自从结婚40年前结了婚就从没吵过一次架。
这句话的主语是没吵过一次架所以谓语用单三形式因此是has
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couple 是可数名词，the couple是单数。

Once these,has become the Kate has never been to the Tokyo,_____?_____,she has been there only once.这个反意疑问句怎么填 never once has the old couple quarreled with each other since they were married 40 years ago.这个句子怎么理解,为什么用完成时态, The heart that once truly loves never for-gets. 请问never ever forget the things that once made you The heat that once truly loves never forgets什么意思翻译 i have never got the third place even once The former love has never bone away The World Has Never Been Untrue是什么意思 Never once has the old couple quarrelled with each other since they were married 40 years ago.为什么助动词用has不用have,而且后面都是they啊,此时的couple应该表示两个人吧, once apart,never back We'll start at once if the rain has stopped. I love the once you,but everything has ceased to Remember once again the passage of memories,has not sweet. 翻译:the day when we once lived and the people once we loved,will never come back Once the familiar turns strange,once we begin to reflect on our circumstances,it's never the same again. The heart has never been injured...The injury will not! He has never forgotten the p____ trip in the mountains .