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 watch a cat in a picture of music .

SOLUTION: You are close to find a photo in a presence of sunlight .

PROBLEM: If you want to recognize a computer then you should appropriate an application program .

SOLUTION: If you want to use a computer then you should mail an application program .

PROBLEM: You would produce a contract because you want a binding agreement .

SOLUTION:
You would get a contract because you want a binding agreement.