What are the English polite expressions:

Hello, Hi! Hello, it is often used to say hello when meeting. Goodbye is goodbye and Good night is good night. Students haven't seen each other for many days, so say hello when they meet. I'm fine. Thank you.

to disturb others to ask questions, say Excuse me first. Others care about helping you. Thank you. Remember the words of thanks, That's OK. I'm sorry for my mistake. Open the door when guests visit. Please come in, please.

for comments and requests, May I… begins first. Agree to permit yes/sure/sure/ok, don't forget. As soon as we met in the morning, Good morning said first.

say hello when we meet in the afternoon. Good afternoon is indispensable. Good evening. Good night. Good night. Passers-by acquaintances pass by, Hello and Hi are all right. Nice to meet you for the first time

How are you often seen? .