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: Com You make sound .

SOLUTION: Com ears make sound .

PROBLEM: If you want to know the bottle then you should have a stone .

SOLUTION: If you rush to hit the bottle then you should have a stone .

PROBLEM: You are nice to find a credit card in a purse .

SOLUTION:
You are likely to find a credit card in a smartphone .