student asking question

Why did he use “did” in this sentence? Is it grammatically needed?

teacher

Native speaker’s answer

Rebecca

"Did" in this context is used for emphasis to reaffirm a statement. It puts the sentence in a question-like form with "did" to give it emphasis. It is necessary in this context to use "did" unless the sentence is reworded. Ex: Did I see her? Yes I did. Ex: Not only did I watch the performance but I filmed it too!

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