He/she has been killed
Your method of approach is ineffective.
It is a more formal way of saying goodbye.
It means "you" in Korean in a more formal way than saying "neo"
Usted is the formal way of saying 'you'.
Where were you = ¿Dónde estabas? or ¿Dónde estaba Ud." which is a more formal way of saying it.
It's "congratulations". A more formal way of saying it is "omedetou gozaimasu"
Drunk is an informal term. Intoxicated would be more formal.
Purchase
洗手间 - washroom/toilet in a more formal and polite way 厕所 - not very formal way of saying toliet
Rendezvous.
Yes, "how do you do?" is a more formal way of saying "how are you?" It is more or less archaic. However, "How do you do" is never responded to literally, by telling the greeter how you are.
"Isoisoäiti" is the most formal way of saying it, a more casual version is for example "isomummi".