5、算式中表示数目(字)的主语通常作单数看待，其谓语动词采用单数形式。如：Twelve plus eight is twenty. / Fifty-six divided by eight is seven.

4、表数量的短语“one and a half”后接复数名词作主语时，其谓语动词可用单数形式(也可用复数。如：One and a half apples is (are) left on the table.

3、若英语是书名、片名、格言、剧名、报名、国名等的复数形式，其谓语动词通常用单数形式。如： “The Arabian Nights”is an interesting story-book.

2、表示“时间、重量、长度、价值”等的名词的复数作主语时，谓语动词通常用单数形式， 这是由于作主语的名词在概念上是一个整体，如：Thirty minutes is enough for the work.

1、what, who, which, any, more, all等代词可以是单数，也可是复数，主要靠意思来决定。如：Which is your bag? / Which are your bags? / All is going well. / All have gone to Beijing.

8、在倒装句中，谓语动词的数应与其后的主语一致。如：There comes the bus./ On the wall are many pictures. / Such is the result. / Such are the facts.

　　　 (二)逻辑意义一致原则：逻辑意义一致就是谓语动词的数必须和主语的意义一致(因有时主语形式为单数，但意义为复数；有时形式为复数，但意义为单数)。

7、由“a lot of, lots of, plenty of, the rest of, the majority of + 名词”构成的短语以及由“分数或百分数+名词”构成的短语作主语，其谓语动词的数要根据短语中后面名词的数而定。如：There are a lot of people in the classroom. / The rest of the lecture is wonderful. / 50% of the students in our class are girls.

　　　 注意： a number of“许多”，作定语修饰复数名词，谓语用复数；the number of“…的数量”，主语是number，谓语用单数。

6、如果集体名词指的是整个集体，它的谓语动词用单数；如果它指集体的成员，其谓语动词就用复数形式。这些词有family, class, crowd, committee, population, audience等。如：Class Four is on the third floor. / Class Four are unable to agree upon a monitor.

　　　 注意：people, police, cattle等名词一般都用作复数。如：The police are looking for the lost child.

5、在定语从句时，关系代词that, who, which等作主语时，其谓语动词的数应与句中先行词的数一致。如：He is one of my friends who are working hard. / He is the only one of my friends who is working hard.

4、either, neither, each, every 或no +单数名词和由some, any, no, every构成的复合不定代词，都作单数看待。如：Each of us has a new book. / Everything around us is matter.

　　　 注意：① 在口语中当either或neither后跟有“of+复数名词(或代词)”作主语时，其谓语动词也可用复数。如：Neither of the texts is (are) interesting. ② 若none of后面的名词是不可数名词，它的谓语动词就要用单数；若它后面的名词是复数，它的谓语动词用单数或复数都可以。如：None of us has (have) been to America.