1
a classmate of + possessive pronoun
of 后接名词性物主代词（mine、hers 等），不接 me。
She is a classmate of mine from university.
她是我大学时的同班同学。
同班同学
先理解核心含义，再看它在真实句子里的用法。
同班同学
an acquaintance that you go to school with
She is a classmate of mine from university.
她是我大学时的同班同学。
在学校同班的学生
A student who is in the same class at school.
和你一起上学的熟人
an acquaintance that you go to school with
另一种类别中的成员,如机车等
A member of a different sort of class, such as locomotives etc.
I met one of my former classmates at the supermarket yesterday.
我昨天在超市遇见了以前的一位同班同学。
My classmates and I are preparing a group presentation for our history class.
我和同班同学们正在为历史课准备小组展示。
Are any of your classmates joining the summer camp this year?
今年你的同班同学有人参加夏令营吗？
of 后接名词性物主代词（mine、hers 等），不接 me。
She is a classmate of mine from university.
她是我大学时的同班同学。
表示“和某人是同班同学”，主语为单数时也常用 classmates。
I was classmates with him in high school.
高中时我和他是同班同学。
one of 后接复数 classmates，强调“其中之一”。
Tom is one of my classmates.
汤姆是我的同班同学之一。
Not this
There are thirty classmate in our class.
Use this
There are thirty classmates in our class.
classmate 是可数名词，表示不止一个同学时要用复数 classmates。中文“同学”没有词形变化，所以容易漏掉 -s。
Not this
Tom is my classmate, but we are in different classes.
Use this
Tom is my schoolmate, but we are in different classes.
classmate 特指“同班同学”；既然不同班，就不能用 classmate。表示同校但不同班的人可用 schoolmate。中文“同学”范围较宽，容易混用。
Not this
I and my classmates are going to the movie tonight.
Use this
My classmates and I are going to the movie tonight.
英语习惯把第一人称 I 放在其他人称之后，表示礼貌；汉语常说“我和同学”，直译成 I and... 很不自然。应把并列短语中较长的“my classmates”放在前面。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
高中同学
One of my high school classmates is now a doctor.
我的一位高中同学现在是一名医生。
老同学
I ran into an old classmate at the grocery store.
我在杂货店偶遇一位老同学。
我的一个同学
A classmate of mine lent me this book.
我的一个同学借给我这本书。
偶遇同学
It was nice to run into a classmate from university.
很高兴偶遇一位大学同学。
大学同学
She went on vacation with her college classmates.
她和大学同学们一起去度假了。
Use classmate naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 class 记作“班级”，mate 记作“伙伴”，同班的伙伴就是同班同学。
语域：neutral 常见场景：校园日常交谈、课堂介绍或写作 classmate 是中性常用词，多用于指同班或同校的同学；口语和书面语中都比较常见，尤其适合学校、课堂等日常交流场合。
发音说明：classmate 结尾为 /meɪt/。mate、roommate、teammate 结尾完全相同；fate、late 与 /meɪt/ 押韵，但拼写不含 mate。注意：classmate 开头的 class 读 /klæs/，classroom 读 /ˈklæs.rʊm/，均不等于 /kleɪs/ 或 /meɪt/。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.