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: News reporters must protect their sources.

SOLUTION: Eye reporters must police their sources .

PROBLEM: If you want to downgrade to a W then you should have a check .

SOLUTION: If you want to go to a family then you should have a birthday .

PROBLEM: A large food store will have many meals of food .

SOLUTION:
A large food store will have many kinds of food.