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 can jump for your flight at a flight terminal .

SOLUTION: You can wait for your flight at a plane terminal .

PROBLEM: If you want to read a typo , go to a bookstore .

SOLUTION: If you want to read a book, go to a bookstore.

PROBLEM: After a banana is picked from a tree, the banana's skin darkens over time.

SOLUTION:
After a banana is picked from a street , the banana 's skin darkens over time .