difference什么时候用复数

想说明“不一样”这个特点，就用单数，因为是不可数

想说明“不相同的地方，不同点”这些可以数出来的就可以使用复数了.

There are many differences between the two languages，There is a difference between the two there some differences between the students?

很多因为单词都有相似的用法

一、当difference 表示"差异，差别"是可数名词:

There are many differences between living in a city and living in the country.生活在城市和生活在乡村有许多不同之处.

二、当difference 表示"差额，差数"是不可数名词:

The difference between 5 and 11 is 6.十一和五的差是六.

Flowers make no/a lot of difference to a room. 一个房间里有没有鲜花没有/有很大差别.

三、当difference 表示"不和，分歧"是可数名词:

They've settled their differences and are friends again.他们已消除芥蒂，重归于好.

make a difference，因为这里的difference 表示"差额，差数"，是不可数名词，所以用a。