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: People can gather money .

SOLUTION: People can spend money.

PROBLEM: You can use a roof to provide shelter.

SOLUTION: You can heat a roof to provide concrete .

PROBLEM: My da bought a gun .

SOLUTION:
My friend tweeted a h .