My copain helped me with my homework.

我的朋友帮我做作业。

He invited his copain to his birthday party.

他邀请了他的朋友参加他的生日派对。

She always shares her lunch with her copain.

她总是和她的朋友分享午餐。

I went to the movies with my copain yesterday.

昨天我和我的朋友去看了电影。

My copain and I love playing video games together.

我和我的朋友喜欢一起玩电子游戏。