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 have a party then you should buy snacks and drinks.

SOLUTION: If you want to have a party then you should buy fish and drinks .

PROBLEM: You can accept or vary the lyrics of a song .

SOLUTION: You can audio or read the lyrics of a song .

PROBLEM: Mothers enable their sons to be clean .

SOLUTION:
Mothers charge their sons to be clean .