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: I measure water from the ocean .

SOLUTION: I take water from the ocean.

PROBLEM: When everyone in the world is slaughtered , it 's a world war .

SOLUTION: When everyone in the world is fighting, it's a world war.

PROBLEM: If you want to watch a film then you should relax at the screen .

SOLUTION:
If you want to watch a film then you should pay at the screen .