2. 意义一致的原则

(1)表时间、距离、价格、度量衡等的名词作主语时，谓语动词通常用单数。例如：

Twenty years is not a long time.

Ten dollars is too dear.

(2)有些集合名词，如family, team等作主语时，如作为一个整体看待，谓语动词用单数;如指其中每个成员，则用复数。例如：

My family is big one.

My family are watching TV.

(3)不定代词由all, most, more, some, any, none作主语时，也要依这些代词表示的意义来决定谓语动词的单复数形式。如果代词代表复数可数名词，谓语动词用复数;如果代词代表单数可数名词或不可数名词，谓语动词用单数。例如：

All of the work has been finished.

All of the people have gone.

(4)疑问代词作主语时，其谓语动词也有两种情况：主语表示复数意义，谓语动词用复数;主语表示单数意义，则谓语动词用单数。例如：

Who is your brother?

Who are League members?

(5)“分数或百分数+of+名词”构成的词组作主语时，其谓语动词要以of后面的名词而定。名词是复数，谓语动词用复数：名词是单数，谓语动词用单数。例如：

It is said that 35 per cent of the doctors are women.

Three -fourths of the surface of the earth is sea.

(6)half, the rest等表示不定数量的名词作主语时，如果所指为复数意义，动词用复数;如果所指为单数意义，动词用单数。例如：

I have read a large part of the book, the rest is more difficult.

Only ten students attended the class because all the rest were off sick.

(7)由what 引导地主于从句作主语时，通常谓语动词用单数形式。但如果所指内容为复数意义时，谓语动词用复数形式。例如：

What she said is correct.

What she left me are a few old books.

(8)凡是以“定冠词+形容词(或分词)”作主语，往往根据意义一致的原则决定谓语动词的单复数形式。如果这种主语指的是一类人，谓语动词用复数;如果指的是一个人或抽象概念，谓语动词用单数形式。例如：

The sick have been cured and the lost have been found.

The dead is a famous person.

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