当主语是分数或百分数时,谓语动词的单复数由of后面的名词决定,主语是可数用are;不可数用is。举个例子:Threequartersofthetheatrewasfull.剧院的座位坐满了四分之三。Threequartersoftheworkersareagainsttheplan.四分之三的工人反对这项计划。主语surface不可数用is