LOL! I have said if I had a nickel for every time I said, "go potty" I would be a millionaire. But you know what, both of my boys will "go potty" when I say it. My Rexy never has accidents in the house, but Rowdy is not neutered and he marks sometimes - but mostly just little sprinkles and it comes and goes
Anyway, both my boys did very well with us taking them out about every 30 minutes. And my Rexy always "went" when I put him on grass - it was the cutest thing - when his feet hit the grass, he went potty. Of course, he also "went potty" in the house before he figured out he was supposed to potty ONLY outside. It didn't take long though!
Good luck.