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: You would download products because you want to take advantage of a sale .

SOLUTION: You would save products because you want to take advantage of a sale .

PROBLEM: A teacher can ask whether a student know the answer to a question.

SOLUTION: A body can ask whether a student know the answer to a question .

PROBLEM: You can train an eating preference to conserve food .

SOLUTION:
You can post an eating distance to preserve food .