Does size matter? Those who don't think it does, say that it is in the motion of the ocean. But I'm not talking about that, silly! And I'm still not ready for mature roles, Direk! Moving on, speaking of the ocean and whether size matters, remember that it does when you're talking about prepositions for all types of vehicles, whether on land, on the sea or in the air. Quite simply, if you're able to walk inside the vehicle to your seat, say you're 'on' it. Otherwise, say you're 'in' it. So, we say, we're on the plane, on the train and on the bus. And say, we're in the car or in the truck. But how about motorcycles? You obviously can't walk inside it; you can just sit on it. Oh, did I say 'on' it?