со своими друзьями

with his/her own friends

→ с
phrase Uncommon #10,111
with his/her own friends Uses possessive reflexive "своими" meaning the subject’s own. Can also mean "with their own friends" depending on context.
RU: Он пришёл в парк со своими друзьями.
EN: He came to the park with his own friends.

Они со своими друзьями напились.

They got drunk with their friends.

Том поговорил об этом со своими друзьями.

Tom talked about it with his friends.

Я познакомил тебя со своими друзьями, моими родителями.

I introduced you to my friends and my parents.

— Париж, я люблю тебя (2006)

Том пришёл вместе со своими друзьями.

Tom came with his friends.

Он со своими друзьями!

He is with his friends!

— Славные парни (1990)

Том где-то играет в футбол со своими друзьями.

Tom is somewhere playing soccer with his friends.

Том играет на улице со своими друзьями.

Tom is playing outside with his friends.

Я еду за город со своими друзьями.

I'm going out of town with my friends.