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 bounce out of a window because of a terrorist attack .

SOLUTION: You would say out of a window because of a terrorist attack .

PROBLEM: You would sign a contract because you want to restore a house .

SOLUTION: You would sign a contract because you want to buy a house.

PROBLEM: You are apt to judge a cow in a green man .

SOLUTION:
You are likely to rob a cow in a green pickup .