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 introduce a start in date event .

SOLUTION: You are unknown to find a calendar in date book .

PROBLEM: If you want to recognize a computer then you should appropriate an application program .

SOLUTION: If you want to use a computer then you should mail an application program .

PROBLEM: You are likely to add a cat in the flower bed .

SOLUTION:
You are likely to say a cat in the flower bed .