inglés example sentences with "what's what"

Someone should talk to him and tell him what's what.
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What's WhatsApp?
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I don't know what's what.
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Tom always knows what's what.
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I know what's what.
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We'll see what's what tomorrow.
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We know what's what.
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He seems to have no trouble understanding stuff that, to me, sounds like hot garbage. He really does know what's what.
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She said she was going to house to study French, but I wasn't born yesterday. I know what's what.
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Everything is changing so fast... I just don't know what's what anymore!
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