student asking question

I don't understand the structure of this sentence well. What does "what's that" do?

teacher

Native speaker’s answer

Rebecca

"What's" in this context is a contraction of "what does". "What's" is normally a contraction for "what is", however, it can also be short for "what does" in certain contexts. So the full sentence here should be "what does that slo-mo Finn know about this?". This sentence is used to question what Finn's role and knowledge in this situation is.

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