"我是他的朋友"怎么翻译?

I'm his friend.
we're friends.
要看你的侧重点是什么了。如果是强调“ 你”是他的朋友，那就用第一个；如果只是说明你们的关系，那就用第二个。

I'm his friend~

We are buddies/friends.
I am his amigo/friend.

I am a friend of his.
I am his friend.
We are friends.
都可以！！！

We are friends.

I am his friend.