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9.与数词相关的主谓一致原则 1)当名词词组中心词为表示时间、路程、金钱或重量等复数名词时，往往根据意义一致的原则，把这些复数名词看做一个整体，谓语采用单数形式。如： Twenty dollars is not enough. Two months has passed before we realized. 但是如果数词单用，表示人或物，谓语动词一般用复数。如： Three were killed and ten were missing in that accident. 2)如果名词词组中心词是分数或百分数+of-词组，谓语动词的单、复数形式取决于of-词组中名词或代词的单、复数形式：如果of-词组中名词或代词是单数或不可数名词，谓语动词用单数形式；如果of-词组中名词或代词是复数，谓语动词也用复数形式。如： Two thirds of the earth is covered with water. Two thirds of the people present are against the plan. 3)如果主语是many a，more than one+单数名词构成，尽管从意义上看是复数，但谓语动词仍用单数形式。如： Many a student in this class has hoped a long break. 4)a+单数名词+or two做主语，谓语动词用单数形式。如one or two+复数名词，谓语动词用复数形式。如： | 
