student asking question

Why is "they're" used, not "it's" at the last? Is it referring to different thing?

teacher

Native speaker’s answer

Rebecca

"They're" here refers to the "mashed potatoes". "They're" is correct here because "they" can be used to refer to plural inanimate objects, and "mashed potatoes" is plural. "It's" would also be correct to use here.

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