Some questions about speaking korean (mainly grammar) I know that you can end sentences different ways to be respectful or casual. I know that ending with 요 is respectful and I heard that ending with 습니다 is even more respectful. But sometimes I hear people use these interchangeably while still talking to the same person. 1. Why do they switch them up? 2. Which one should I use when I first meet someone and say hello? 3. Which one should a student use in an essay? 4. How to address your boss? I also hear sentences that end with 이, can anyone verify when and why it is used? Thank you in advance ^_^