主谓一致Ten thousand tons of coal were produced last year.Three

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主谓一致
Ten thousand tons of coal were produced last year.
Three tons of coal is enough.
句中的谓语为什么一个是单数一个是复数呢?不是说重量做主语,谓语应该用单数吗?

参考:
第一句
强调是"十千吨"(一万吨)",是复数,所以后面的谓语用复数.句子的主语是煤而不是重量.
如果改成 the weight of coal produced last year was ten thousand tons.主语才是重量
第二句
主语是煤,这时候说话人把多少数量的煤看成一个整体.重点不是多少吨煤.而是强调一个整体的量,所以看作单数.
语境与说话者的目的不同,侧重对象不同,谓语动词会有相应的改变.你也可以参考一下集体名词的概念.参考资料里"意义一致"的第五点

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