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: News reporters must protect their sources.

SOLUTION: Eye reporters must police their sources .

PROBLEM: You would sign a contract because you want to restore a house .

SOLUTION: You would sign a contract because you want to buy a house.

PROBLEM: You would eat a fig because you want to have dessert .

SOLUTION:
You would eat a person because you want to have energy .