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 nice to find water in soup .

SOLUTION: You are unprepared to find water in soup .

PROBLEM: Smoking is usually only allowed in certain places at work.

SOLUTION: Smoking is usually only met in certain institutions at work .

PROBLEM: A car can hit a tree.

SOLUTION:
A car can hit a basketball .