主谓一致：语意一致的相关规则

主谓一致是英语语法的一个重要的版块，今天，小编为同学们准备了相关的主谓一致语法体系下的谓语动词用单数的清况，一起来看看吧！

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结尾的名词指一门学科时，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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