Oil is one of the world's major sources of energy.
I'm supposed to rewrite this sentence as a negative sentence, that is, a sentence that means the same thing but uses a negation.
I've thought of two possible ways to do this:
- Oil is not one of the world's minor sources of energy.
- Not many sources of energy are as major as oil.
I've been told that the first one is wrong because major is used in a comparative degree, but I think it's positive. If I do the same for "Steve is taller than him" I get "Steve is not shorter than him" which is not the same sentence because Steve could be taller or just as tall as him, so this transformation is not valid for the comparative degree. My query is whether "one of the world's major sources" is comparative, because then it would be wrong.
Can someone tell me if either of these sentences is correct? Is there another way to do this?
Some other examples:
It is useless.
It is not useful.
They had always fallen into the realm of possibility.
They had never fallen into the realm of impossibility.
He likes to go to the seashore.
He doesn't dislike going to the seashore.