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 go on the stage because you want the girl on the stage.

SOLUTION: You would start on the stage because you want the girl on the stage .

PROBLEM: All oceans contains salt fish .

SOLUTION: All oceans contains salt water.

PROBLEM: The effect of taking an art gallery is to enjoy paintings .

SOLUTION:
The test of visiting an art courtyard is to enjoy paintings .