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: Water is composed of hydrogen and oxygen.

SOLUTION: ice is composed of hydrogen and oxygen .

PROBLEM: If you want to degrade into a coma then you should sport another car .

SOLUTION: If you want to go into a coma then you should specify another car .

PROBLEM: CCC is the name that we give our mistakes .

SOLUTION:
Experience is the name that we give our mistakes.