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: travel to the family shop for a hair cut .

SOLUTION: Listen to the op shop for a hair cut .

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 swear to hear singing then you should introduce to the birds .

SOLUTION:
If you want to hear singing then you should listen to the birds.