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 can use an underground area to protect from sky attack.

SOLUTION: You can use an underground area to protect from sky ash .

PROBLEM: If you want to take a course then you should go to school.

SOLUTION: If you want to take a course then you should recommend to school .

PROBLEM: Hearing the technology requires hidden ears or hearing aids .

SOLUTION:
Hearing the news requires good ears or hearing aids.