15 minutes做主语时,是单数还是复数?例如,Surely,15 minutes is enough time for you to have a coffee.这里的be动词为什么是is?

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15 minutes做主语时,是单数还是复数?例如,Surely,15 minutes is enough time for you to have a coffee.这里的be动词为什么是is?
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15 minutes做主语时,是单数还是复数?例如,Surely,15 minutes is enough time for you to have a coffee.这里的be动词为什么是is?
15 minutes做主语时,是单数还是复数?
例如,Surely,15 minutes is enough time for you to have a coffee.
这里的be动词为什么是is?

15 minutes做主语时,是单数还是复数?例如,Surely,15 minutes is enough time for you to have a coffee.这里的be动词为什么是is?
15 minutes做主语时,谓语动词用单数.这是要遵循主谓一致的原则,详细见如下解释,
表示时间、距离、度量、重量、金额等的复数名词作主语,被看作整体时,谓语动词用单数;若强调个体也可以复数.如:
Twenty years is a long time.
二十年是很长时间.
Two kilometers is a long way to go on foot.
步行两千米是一段很长的路程.
Six months have passed,and we still have no news of them.
六个月过去了,我们依然没有他们的消息.
比较:
Ten dollars is too much for this old coin.
这个古币没有10块钱这么高的价格.
Three dollars were paid for the old coin.
那个古钱花了3块钱.
Twenty years is a long time.
20年是一段很长的时间.
Twenty years have passed since they got married.
他们结婚已有20年了.

复数;当成整体时间的!

15 minutes 是一个时间段。
时间无法分割,都是用单数的。

把 15 minutes 当成整体的一段时间,所以用 is