I know it's commonly said but wonder if it is grammatically correct to say "for dead". As far as I know, dead is an adjective and I think for can't be followed by an adjective. It requires a noun.
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AbilTo learn someting is a fun!I would say, Learning something new is fun
AbilThe gang members beat him until he lost senses (/became unconscious) and left him behind for dead.I don't think 'behind' is necessary.