Below are some frequently asked questions about greetings in English:

In a formal setting, it's important to use formal greetings such as "How do you do?" and "It's a pleasure to make your acquaintance". These convey respect and formality.

Formal greetings are used in professional or respectful situations, while informal greetings are used in casual or friendly interactions.

Unexpected visits can be greeted with expressions of surprise and joy, such as "What a wonderful surprise! How long are you staying?" or with polite questions like "To what do I owe the pleasure?"