К my friend ставишь ещё любое имя.
My friend is the eldest brother/sister in his/her family.
My friend is the tallest boy/girl in the class.
My friend is better student than...(имя).
My friend is more hard-working than me.
My friend is the cleverest boy/girl in the class.
My friend is more patient than me.
My friend is the most hilarious person I have ever met.