classmate是單數還是複數

　　classmate例句分享

　　It is really nice to have such a good classmate.

　　有這麼好的同學真是太好了。

　　He turned around, and I recognized him as a former classmate.

　　他轉過來，我才認出是位老同學。

　　He is my classmate and also my best friend.

　　他是我的.同班同學也是我最好的朋友。