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: Art is created by an artist.

SOLUTION: Art is oppressed by an underdog .

PROBLEM: You are likely to find a shark around in ocean.

SOLUTION: You are likely to seem a shark around in ocean .

PROBLEM: If you thrive to grow worms then you should have a garden .

SOLUTION:
If you plant to freeze vegetables then you should have a garden .