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: You are likely to find a football stash in an envelope .

SOLUTION: You are sorry to find a th parcel in an envelope .

PROBLEM: You win a challenge of chess when you capture your opponent 's wallet .

SOLUTION: You win a game of hunting when you capture your opponent 's king .

PROBLEM: You are qualified to find a loan as a part of a need .

SOLUTION:
You are likely to find a door as a part of a wall.