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: Students can level basketball at school .

SOLUTION: Students can ask basketball at school .

PROBLEM: People can learn hands .

SOLUTION: People can adjust hands .

PROBLEM: Peace forces allowed the attackers to rout .

SOLUTION:
Security checkpoints allowed the attackers to flee .