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: A bike can only acquire a liberal amount of weight .

SOLUTION: A bike can only retain a certain stamp of advertising .

PROBLEM: The sake of selling your new book is to recieve madness .

SOLUTION:
The sign of selling your new mansion is to recieve war .