Is it "I am on the bus" or "I am in the bus"? I read it somewhere that if a moving object is at still then it is "in" otherwise it is "on" which is to be used. If that is true, then can I assume, that the moving object is at still if "in" is used in a sentence? I always see people writing the same sentence twice, as if to stress a point; e.g. Am I right? Or Am I right? What really is its use?