three years ;或one and a half months 作主语 哪种情况下 谓语用单数 , 哪种情况下 用复数?

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threeyears;或oneandahalfmonths作主语哪种情况下谓语用单数,哪种情况下用复数?threeyears;或oneandahalfmonths作主语哪种情况下谓语用单数,哪种情况下

three years ;或one and a half months 作主语 哪种情况下 谓语用单数 , 哪种情况下 用复数?
three years ;或one and a half months 作主语 哪种情况下 谓语用单数 , 哪种情况下 用复数?

three years ;或one and a half months 作主语 哪种情况下 谓语用单数 , 哪种情况下 用复数?
three years作主语时谓语动词要用复数.one and a half months作主语时谓语动词要用单数(凡是大于一而小于二的数,后面接可数名词时要用复数,如上面的months.但当这个数词和名词作主语时,谓语动词却要用单数.)如:
Three years have passed.
One and a half months has passed.
但如果把它们看作一个整体,一个时间概念,则都用单数.如:
Three years is a long time.
One and a half months is a short time.
不过现在英语语法的规定性比以前较弱了.如Three years have passed.也可以用单数has.

作主语时都是单数,把它当做一个整体,例如:Three years is a long time.

sorry i don't know.Just for baidu score.