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 want to have a party then you should buy snacks and drinks.

SOLUTION: If you want to have a party then you should buy fish and drinks .

PROBLEM: You are likely to find water in a glass.

SOLUTION: You are likely to order water in a glass .

PROBLEM: You would go for a run because you like to get some exercise.

SOLUTION:
You would go for a run because you like to get some potassium .