I like to try and pass using the thing where you put your knee between his buttcheeks and push out. I can usually get by if the guy is around my size. For Those really tough or bigger guys guys though who won't let me pass... I like to bait my arm and wait for him to make a move, and as soon as he does I explode and toss one of his legs over my head then pass to side control.
That's just what I do because I'm just a whitebelt and don't know a cajillion techniques like eddie bravo or marcelo garcia like "oh shit well do a backflip then land on his face then take a shit on it!!".