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.

You are likely to find a cellar with a lock in action .
You are likely to find a door with a lock in prison.

If you want to receive a degree then you should go to school.
If you want to transfer a degree then you should go to PhD .

If you operate to compute a sum then you should use a calculator .

If you want to compute a depth then you should use a Boolean .