Bart: Give it up Dad.  Piggy ain't coming back. How can you translate “ain’t coming back”? The sentence is from the script from “the Simpsons”. [Piggy gets caught in a dam spillway, and when the pressure builds,        it shoots into the sky.]        It's just a little airborne, it's still good, it's still good!  Bart: [Crestfallen.]  It's gone. Homer: I know. Homer and Bart are standing in their backyard.  Homer is scanning the sky with binoculars.  Bart: Give it up Dad.  Piggy ain't coming back.   Let me express my idea. Piggy ain’t coming back = Piggy is not coming back 1) present continuous with a future meaning : “He is having dinner with Kate on Friday.” (He has already decided and arranged to have dinner) (Piggy cannot decide and arrange) 2) I have a firm intention or have made a definite decision to do something. “I’m not asking Tom to the party.” Can I translate it into “Bart definitely decided that in his opinion Piggy ain't coming back”? ( I don’t think so.) 3) the shortened form of “Piggy is not going to come back.” = (I predict that) Piggy is not coming (ain’t coming) back. I do not think any of these 3 usages makes sense to me.