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 are likely to find a runway in an airport.

SOLUTION: You are likely to learn a runway in an airport .

PROBLEM: You tell a lie because you think no one will stake out .

SOLUTION: You tell a lie because you think no one will fill out .

PROBLEM: You are unprepared to fly a bullet in guns .

SOLUTION:
You are ok to find a bullet in guns .