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 head to have a heart attack then you should be slow .

SOLUTION: If you want to have a heart attack then you should be fat.

PROBLEM: It is a technique to withhold or absorb certain drugs .

SOLUTION: It is a crime to possess or cure certain drugs .

PROBLEM: Computers can reproduce video .

SOLUTION:
Computers can launch video .