"You have many best friends."
i think, "do you have friends?" or "you have friends".
Best Friends in Spanish is:los mejores amigos
You have lots of posters in your room
USTEDES --- You (formal - familiar plural in Spanish America; only formal plural in Spain):Ustedes son mis mejores amigos --- You are my best friends."Vosotros" is used instead in familiar plural contexts in Spain:Vosotros sois mis mejores amigos --- You are my best friends.
The phrase "por que tienes en amigos" doesn't make sense in Spanish. It seems like a non-standard or incorrect combination of words. A correct phrase could be "¿Por qué tienes tantos amigos?" which translates to "Why do you have so many friends?"
you have more friends on facebook than you believe
Son los mejores
mejores que he tenido= I think it means "better if I had"
"Primos tienes" means "Do you have cousins?" in Spanish.
"Tienes" means "you have" or "do you have".
si can be "if" or "yes" tienes comes from tener which mean "to have" there it can be either "if you have" or "yes you have/you do have"
the best. for example my best friends (females) : mis mejores amigas