主谓一致：语意一致的相关规则

1）当名词词组中心词为表示金钱、时间、度量、距离、价格等复数名词时，把这些复数名词看作一个整体。谓语动词采用单数形式。

Twenty-five dollars is too much to pay for that shirt．

Fifty minutes isn’t enough to finish this test．

Ten miles seems like a long walk to me．

2） 以“-s”结尾的书刊名、国名、组织名、游戏名、运动名，谓语动词用单数以-ics结尾的名词指一门时，常用单数谓语动词形式。当这些名词表示实际内容时，谓语动词则用复数形式。

这类单词有： 

economics经济学        electronics电子学

physics物理学          politics政治学

mathematics数学        statistics统计学

Roots  was a novel about a slave family．

His politics were a matter of great concern to his friend．

Politics is his favorite subject．

Statistics show that approximately 40 percent of all marriages in the US end in divorce．

Statistics is a subject that is difficult to learn．

3）有些表示某类别的总称的集合名词，如：machinery(机械)，clothing(衣服)，luggage(行李)，furniture(家具)，equipment(设备)，jewelry(珠宝)等作主语时，谓语动词常用单数。如：

My luggage was sent by air．

The equipment of our factory is all imported from Britain.

4） 不定式、现在分词和从句作主语，谓语动词通常用单数：

Playing with fire is dangerous．

注意： 若用and连接两个动名词、不定式短语或主语从句，表示两个不同的概念，则谓语动词用复数形式。若表示同一概念，则谓语动词用单数形式

Early to rise and early to bed is a good habit．

When and where the building will be built hasn’t been decided．

主语从句要根据从句表达的意思而定

What she said is correct．    

What he gave me are five English books．

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