Student or Learner
- teacher or parents, "This is your cup of tea."
- student or children, "Thanks."
- As the above conversastion, is it an impolite way for a student or children to say thanks only to a teacher or parents?
- Can a staff say thanks only to a boss, is it too casual?
- In a very formal situation, shall I say, "Thank you very much, I apprecate that." to express gratitude to all aspects? If not, how shall I say?
(any grammar mistake in this message?)