to be / become a friend of sb :
We've been friends for years.
They had a quarrel, but they're friends again now.
Simon finds it hard to make friends with other children.
to be / become a friend of sb :
We've been friends for years.
They had a quarrel, but they're friends again now.
Simon finds it hard to make friends with other children.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005