What is the difference between dayo and desu? I was participating in a chat and a person said genki dayo. I am assuming that dayo and desu mean the same thing and can be used interchangeably. Thank you.
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です is polite form. だよ is casual and friendly. You shouldn't use them interchangeably.
If you use だよ to your boss or unfamiliar people, they would think you are rude.
answered Jul 4 '17 at 11:26
