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: If you want to go to market then you should get in car.

SOLUTION: If you want to plan to market then you should get in fact .

PROBLEM: You would bake a cake because a friend was celebrating a birthday.

SOLUTION: You would bake a number because a friend was wasting a birthday .

PROBLEM: You are likely to find a stall in a school .

SOLUTION:
You are likely to find a victim in a school .