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.

Example Input: A key can be a framework to a problem .
Example Output: A key can be a solution to a problem.

Example Input: You are likely to find a building in the know .
Example Output: You are likely to find a building in the back .

Example Input: If you promise to have a checkup then you should go to the doctor .
Example Output:
If you time to have a checkup then you should go to the doctor .