Whenever you say a word make sure the action also takes place. It doesn't matter what language you are using to give them a command. You have to ensure consistency (100% of the time), and once you use the command, make yourself ready for their action. We have to consciously ignore the temptation to use random words that sound right to us. The words we use for dogs have to have an exact meaning and are simplified for the dog to follow without getting confused.Be mindful of the words you use, else you will unknowingly teach them to ignore you.