Su / tu / vuestro (a) mi mejor amigo (a) = Your best friend
your my best friend (an illogical sentence)
If you meant: 'You're (= you are) my best friend' - Es / eres mi mejor amigo (a)
In spanish, "best friend" is mejor amigo(a), amigo is for a boy and amiga is for a girl.
mejor amigo (or amiga if the best friend is a girl)
Por mi amigo mejor. - By my best friend.
What is your best friend like? (the best friend is female)
Best of luck to you my friend is very easy to translate. Best of luck to you my friend = mejor de las suertes a mi amigo
Te amo mijor amiga means i love you my best friend.!
'No soy tu mejor amigo?'
perdí a mi mejor amigo
Soy tu mejor amiga.
Mis mejores amigos would be the best way to say "my best friends" in Spanish.
As written, it means "How are you your best friend."
You could say "mejor amigo/a".