>>IvyMik+oe
You should go, say, six months, in which you never use “suppose” in the passive voice. Whenever you feel the inclination to say “it is supposed...” or “you're supposed to...”, force yourself to rephrase your sentence in the active voice. This requires, of course, that you find a supposer, and name him. At that point you will discover what it is you're really trying to say.