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Would you say:

I don't know anybody who has as much energy as John.

or

I don't know anybody who has as much energy as John does.

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The second one.

I don't know anybody who has as much energy as John.

As John what? It is kind of implied, but it could be:

I don't know anybody who has as much energy as John wasted.

I don't know anybody who has as much energy as John when he is playing sports.

You need to say does.

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This is one of those implied words in English: I don't know anybody who has as much energy as John [does] or as John. Both are correct. This is similar to: Do you want to play tennis today? Yes, I want to [play tennis] but I'm busy all day.

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