student asking question

Doesn't it sound more natural to use "it's" instead of "I'm"?

teacher

Native speaker’s answer

Rebecca

No, it doesn't sound more natural than "I'm." Saying "it's one short" sounds very weird in English. We use "I'm" here because it refers to who made the mistake, John. You would use "it's" when there is not an identifiable subject or when something was previously mentioned.

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