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: You are likely to find water in a glass.

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

PROBLEM: Smoking cigarettes is a nasty Business .

SOLUTION: Smoking cigarettes is a nasty habit.

PROBLEM: A shielding is used for protect the head from explosion .

SOLUTION:
A screen is used for protect the head from invasion .