TASK DEFINITION: Given a sentence, generate a new sentence by performing small changes on the sentence. Here, make sure that the changes are semantically related and syntactically similar to the input. And the generated sentence should have high commonsense plausibility, that is to have reasonable probability of it being true.
PROBLEM: If you want to degrade into a coma then you should sport another car .

SOLUTION: If you want to go into a coma then you should specify another car .

PROBLEM: A credit card is disposed of plastic .

SOLUTION: A credit card is handmade of plastic .

PROBLEM: You would buy a shirt because your others are the wrong size.

SOLUTION:
You would allow a set because your others are the wrong size .