we wear school uniform at school。 uniform为什么不加s？

uniform指制服，是个可数名词，但有时却是不可数名词，例如in

uniform就是不可数的，‘他穿着校服’是He

is

in

school

uniform，‘他们穿着校服’同样是They

are

in

school

uniform。

而wear

uniform则可不可数都可以，你可说They

wear

uniforms，也可说They

wear

uniform。一般而言，uniform是可数的，例如：He

is

wearing

a

new

school

uniform,

which

sits

badly

on

him（他穿的新校服并不合身）。