I just watched episode one of Rick and Morty. Rick said “ I had to make a bomb” why would he used had to instead of have to when he has not yet make a bomb?
Perhaps he said I had to make a bomb because he changed his mind and now he doesn't consider it necassary to make it or the situation changed somehow where he isn't required to make a bomb anymore. Or perhaps he needed to make a bomb at a particalar time in the past, but he didn't manage to make it. As you can see it's hard to say what he meant by that without much context.