Saludos/Despedidas/Expresiones

"Buenas noches" means:

• Good morning
• Good afternoon
• Good night.
  Good evening.
• Good day

"Buenos dias" means:

• Good morning
• Good afternoon
• Good night.
  Good evening.
• Good day

"Buenas tardes" means:

• Good morning
• Good afternoon
• Good night.
  Good evening.
• Good day

Hasta luego.

• See you later.
• Nice you to meet you.
• See you tomorrow.
• The pleasure is mine.

Hasta mañana.

• See you later.
• Nice you to meet you.
• See you tomorrow.
• The pleasure is mine.

¿Cómo está usted? 

• What's your name (formal)?
• How are you? (familiar)
• How are you? (formal)
• What's up?

¿Qué tal?

• When is your birthday?
• How are you?
• How's it going?
• What's your name?

Muy bien.

• Very bad.
• Very well.
• So-so.
• Okay.

Familiar or formal?
Talking to a classmate.

• Familiar
• Formal 

Familiar or formal?
Talking to a teacher.

• Familiar
• Formal