あいさつ / greetings

おはようございます。
ohayoo gozaimasu

ありがとうございます。
arigatoo gozaimasu

goodbye 

※ Sayoonara is used as a greeting between students and teachers at school, or when you are saying goodbye to someone you will never again.

goodbye (formal situation)

※ If you are saying goodbye to someone you meet all the time in formal situations.

しつれいします。
shitusree shimasu

goodbye (casual situation)

※ If you are saying goodbye to someone you meet all the time in casual situations.

Good job today. See you tomorrow.

※ If you are saying to colleagues when leaving work in a business situation.

おつかれさまでした。
otsukaresama deshita