be friends with?

问题描述:

be friends with?
be friendly with 与某人友好
be friends with
做题时遇到这么一句话:
You have to be friends with your pupils and take good care of them……
难道是印刷错误?这是一道改错题阿郁闷(错误不是friends这一块,我改的这一块,人家答案改得别的地方……)
那我要是把它改成
be friendly with 能算对吗

be friends with 和某某成为朋友
相当于make friends with sb