You're my best friend for ever.
其实英语中不常用forever的因为实际上没有永远的
通常用always
You're always my best friend.
you are my best friend
You will always be my best friend forever ever.
forever ever强调永远永远,是很常见的口译。
always强调一直是。
You are my best friend!!!
绝对标准!
我来自加拿大,我们多数是这样说的you are my best friend forever