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: Expensive chocolate melts at mid temperature .

SOLUTION: Expensive chocolate melts at face temperature .

PROBLEM: You are unknown to find a wheelchair around in a farmers field .

SOLUTION: You are pleased to find a limp around in a farmers field .

PROBLEM: You would execute a contract because you stopped to get a job .

SOLUTION:
You would get a contract because you needed to get a job.