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 change your relationship then you should get plastic surgery .

SOLUTION: If you want to change your appearance then you should get plastic surgery.

PROBLEM: The source basically wants java .

SOLUTION: The world basically wants peace.

PROBLEM: Walking in the woods is a pleasant means of security .

SOLUTION:
Walking in the woods is a pleasant means of education .