instruction:
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.
question:
A teacher can ask whether a student know the answer to a question.
answer:
A body can ask whether a student know the answer to a question .


question:
A pencil is discarded for writing .
answer:
A theme is used for b .


question:
A police officer 's expertise is to enforce the law .
answer:

A police officer's job is to enforce the law.