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So I’ve read and noticed that Japanese speakers regularly switch from using だ to です and using both plain and 〜ます forms very frequently throughout a conversation even with friends. Why is there such a common change in formality with people you’re close with or know well? And how do they decide which to use when?

Edit: I don’t mean transitioning permanently, I mean in everyday conversations where the switch is random. I have a friend who switches all the time while we talk and I’ve seen street interviews where the formality is completely all over the place. Why does it switch so often?

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    My answer explains when and how someone temporarily switches from and to casual form. They do it unconsciously, and it's hard to generalize. – naruto May 28 '19 at 22:17
  • thank you, i understand!!! – jacoballens May 28 '19 at 23:47