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: A coat of happiness does n't make us happier .

SOLUTION: A lot of sleep doesn't make us happier.

PROBLEM: You can use a swimming pool to swim,.

SOLUTION: You can use a kick approach to swim , .

PROBLEM: You would carry in a carriage because you want a physical tool .

SOLUTION:
You would run in a marathon because you want a physical challenge.