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.

Example Input: When everyone in the world is slaughtered , it 's a world war .
Example Output: When everyone in the world is fighting, it's a world war.

Example Input: A teacher can ask whether a student know the answer to a question.
Example Output: A body can ask whether a student know the answer to a question .

Example Input: If you want to leave the line then you should put up your choice .
Example Output:
If you want to leave the line then you should put up your hand.