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They're so much alike ))))
Fix'd.

No. It won't.
There is the alternative though:
Вы готовы?
(literally "Are you ready?")

depending on whether you adrress to a single person (your friend) or several persons, or a person you...

Generally it's correct.

The only thing I wish to add that that 'ли' particle is generally translated as 'if' or 'whether' in more complex sentences. It can't be translated here, though.

Он...