student asking question

What's "so" mean and how's it used here?

teacher

Native speaker’s answer

Rebecca

Here, "so" is an adverb that refers back to what was previously said and has a similar meaning to "true." The phrase "Is that so?" is asking, "Is what you said true?" Ex: Is that so, Ryan? Did you really lose the keys? Ex: A: I don't like pineapple on pizza. B: Is that so? Then why did you order it?

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