classmate是单数复数

classmate是单数，表示同班同学的意思，复数形式是classmates。

双语例句

She felt like a fifth-grader who had snitched on a classmate.

她觉得自己就像一个告发了同班同学的五年级学生。

I\'m going to call on one of my former classmates.

我要去看望我的一位老同学。

The meeting of the old classmates was extremely cordial.

老同学聚会在一起，分外亲热。

We are all old classmates so why stand on ceremony?

我们都是老同学，你还外道什么？

He made a profession of friendship to his classmate mary.

他向他的同学玛丽表白了他的友情。