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: Computers can emulate audio .

SOLUTION: Computers can decrypt audio .

PROBLEM: You are likely to find a neighbor in a village .

SOLUTION: You are likely to find a bus in a village .

PROBLEM: People need signals to hear noise .

SOLUTION:
People need ears to hear noise.