不客气
I am fine.
teacher
你好
早上好
再见
我很好。
谢谢
我们
老师
同学
How are you?
you (plural)
老师们
we, us
Hello (polite)
你们
classmates
你好吗？
good morning
Thanks
不用谢
Good-bye
同学们
您好
classmate
You're welcome; no need to thank
teachers
Hello
You're welcome; no need to be polite