classmate是单数还是复数

classmate例句分享

It is really nice to have such a good classmate.

有这么好的同学真是太好了。

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

他转过来，我才认出是位老同学。

He is my classmate and also my best friend.

他是我的.同班同学也是我最好的朋友。