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 write a poem then you should use a pen.

SOLUTION: If you want to stitch a poem then you should use a dictionary .

PROBLEM: A relationship can last for a long work .

SOLUTION: A relationship can last for a long week .

PROBLEM: You are likely to drown a sock in a damp cave .

SOLUTION:
You are likely to find a ladder in a damp cave .