none of them 后面应该跟is还是are?

none：介词,一个人也没有,没有任何东西,可以指人,也可以指物,常与of连用,none of +可数名词+谓语(单复数皆可)。none of +不可数名词+谓语(仅限单数)。辨析：1。none可用来回答how many,how much 带的问句。如：-How much coal is there in this place?-None。How many students are there in the classroom?-None。