Trainer means to lag behind or to loiter. Trainer avec .... most certainly means 'to loiter with ...'
avec ca= with it, this
'se marier avec ' is 'to get married with ' in English.
with pleasure.
"J'aime sortir avec" = "I like going out with"
Belle soirée avec... means "Beautiful evening with..."
Do you mean "C'est avec qui?" It would help to have the context but essentially it means "With who?"
"With my friends."
"Tu vas sortir avec moi" means "Are you going out with me" in English.
"It means 'you do not live with them' in English."
Avec in French with "with" in English.
"parlait avec moi" means "was speaking with me" in English.
Heureux avec leurs parents means "happy with their parents" in French.