the class 是单数还是复数

the class 是单数还是复数 Class three 是单数还是复数? tht whole class是单数还是复数? Half of the class后接单数还是复数 the class 后加单数does还是复数do? half of the class后谓语是单数复数 the boys of Class One是单数还是复数?一班的男孩们.后面是填is还是are? the couple是单数还是复数? the family是单数还是复数? the Chen family,是复数还是单数 The police 是单数还是复数 all the后面是单数还是复数 the students是单数还是复数 The Green family是复数还是单数? the white family 是单数还是复数 the Zhang family是单数还是复数 the Greens family 是单数还是复数. the police 是单数还是复数