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1、分数、百分数等修饰名词作主语时数的问题,(1)分数和百分数不能直接跟名词或代词,而是后跟of+冠词/限定词+名词/代词,其后的谓语动词与后面的名词或代词在人称和数上保持一致。当per cent(percent)+of+复数名词(或集体名词)作主语时,谓语动词用复数。1.Fifty percent of the students in our school are girls.我们学校百分之五十的学生是女生。,当percent of+单数名词、代词或不可数名词作主语时,谓语动词用单数。Ninety percent of the work has been done.2几分之几+of+单数名词(或
2、不可数名词)作主语时,谓语动词用单数;Three-fourths of the surface of the earth is sea.,如果几分之几+of+复数名词或代词作主语,谓语动词用复数。,第一,数词的基本考点,1.hundred,thousand和million的用法若hundred,thousand,million,billion等词的前面有基数词或several修饰时,hundred,thousand,million,billion等只能用单数形式;注意hundred,thousand,million,billion等词前不能用many,若表示不确定数目的数百、数千、数百万等时,
3、要用它们的复数形式,还要加上of。,2.dozen与score的用法,(1)dozen(一打,十二),score(二十)与具体数词或与many,several 等连用时,后不加s,所修饰的名词前常省去of。如:two dozen eggs 两打鸡蛋,many dozen pencils好多打铅笔;dozen,score的复数形式后接of时,表示许多,是概数。如:dozens of eggs几十个鸡蛋,scores of pencils几十支铅笔。此外,有数词+score+of+名词这种用法。如:two score of eggs 40个鸡蛋,three score of people 60个人。,(2)当所修饰的名词之前有限定词these,those,my,your等或是修饰人称代词宾格them,us,you时,这时需要加of。如:two dozen of these pens,three score of them。,