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.
Q: You would program a computer because you want it to perform a vital task .
A: 
You would implement a computer because you want it to perform a special task .