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 note in a bank .

SOLUTION: You are likely to splash a fortune in a bank .

PROBLEM: You can use a piano to reverse chess .

SOLUTION: You can use a pin to launch chess .

PROBLEM: You are likely to obtain a van in the football stadium .

SOLUTION:
You are likely to find a fan in the football federation .