同学单词是classmate。classmate的例句：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）。

classmate的例句：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）；I'm chatting with a classmate of mine（我现在在和我的一个同学聊天）。