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 smoke then you should have hazard insurance .

SOLUTION: If you wear to smoke then you should have cancer insurance .

PROBLEM: If you want to enhance software then you should learn to program computers .

SOLUTION: If you want to classify software then you should rewrite to program computers .

PROBLEM: The ocean can be seen through a pole , if the window marks the ocean .

SOLUTION:
The ocean can be seen through a window , if the man faces the ocean .