你的问题是这样的：
1 the rest 如果指代复数名词,这个 the rest 就是复数形式.比如说：Twenty of the students are in the classroom and THE REST ARE in the reading room.
2 如果 the rest指代不可数名词,这个the rest就是单数形式：He has drunk some of the milk,and THE REST IS still in the bottle.