Kharis speaks english.
Pretty good trick, for a mummy. I noticed it at the end when they are in the swamp and whats-her-name tells him "put me down!"
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I think the idea is since he is dead he can now understand any language even if the poor bastard can't say a word of any language because they ripped out his tongue...
The scenes where they show him speak English are basically all in the imagination of Cushing's character, when he narrates the story - how the hell is he supposed to know what it was really like?
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I took the flashback as being creative license to show us, the audience, what was said. And in the contemporary setting when he seemed to understand the demands to put her down, that could have been on a psychic level of some kind. I think a few thousand years of being dead and without a tongue would force you to develop some level of psychic communication.
Random fact: This isn't the only time Christopher Lee played a mute. He played Dracula as mute in Dracula: Prince of Darkness.
Or sometimes it's just pretty obvious what one is trying to say.
"When the chips are down... these Civilized people... will Eat each Other"
Though he still understood the high priest's commands which were all spoken in English. It's the same as the 1940s Kharis films at Universal when George Zucco, or any of the other actors playing the high priests were giving commands.
"Do you mind if I don't smoke?" ---Groucho Marx