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 talk a frog in a backyard .

SOLUTION: You are likely to find a wound in a war.

PROBLEM: pi can climb a hole .

SOLUTION: pie can climb a park .

PROBLEM: agers must feed their pets .

SOLUTION:
People must feed their youths .