do/did can use as assistant-verb to emphasize what you are saying (sentence meaning)
4.used when no other auxiliary verb is present, to emphasize what you are saying （句中無其他助動詞時，用以加強語氣）
■He does look tired. 他的確顯得很疲倦。
■She did at least write to say thank you. 她至少還寫了信道謝。
■Do shut up! 把嘴給我閉上！ British English
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