three months是单数还是复数

three months是单数还是复数 three fifths 是单数还是复数? Class three 是单数还是复数? three fifths 是单数还是复数? three glasses of water谓语动词是单数还是复数? 是three-month还是 three-months对 three and three-sevenths后面的系动词是单数还是复数 Two months后谓语用单数还是复数 several months后面加单数谓语还是复数谓语 three months is a long for me ,three months 是复数,为什么有要看成整体 Parents是单数还是复数是单数还是复数(简练) ''people''是复数还是单数? clothes是单数还是复数? weather是单数还是复数 chocolate是单数还是复数? family是单数还是复数 people是复数还是单数? people是单数还是复数?