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: If you pledge to duck to an opera then you should draft tickets first .

SOLUTION: If you want to go to an opera then you should buy tickets first.

PROBLEM: You are likely to involve a cigarette in a reaction .

SOLUTION: You are frustrated to find a cigarette in a nightclub .

PROBLEM: A handbag is a bag shipped by lottery .

SOLUTION:
A handbag is a bag presented by b .