A 1. No one I've met in the US uses "how do you do?" unless they are pretending to be an upper-class Englishman. It is somewhat old and formal with a response that may seem weird nowadays. Peter: How do you do? Paul: Oh! How do you do? In real life, most people would think "You just asked the same question without giving an answer." A 2. Some common answers - * I'm fine. How about yourself? * Doing good. And you? * Fine. Thanks!

These days we tend to use ' Hello, nice/ pleased to meet you' in place of 'how do you do?' Although some people still use the latter especially on very formal/business occasions. 'Good day' isn't really used in Britain. We say 'Good morning/ afternoon/ evening' depending on what time of the day it is and 'hello' for informal occasions. Answers to 'How are you?' are normally 'I'm fine thank you/ thanks', 'I'm very well thank you/ thanks' and we usually return the question and ask 'what about you? or 'and you?'

I find myself using "Good. How about yourself?" quite often (It works well both at and outside of work). Oftentimes you will hear "Fine. You?". For close friends, or in places outside of work (such as at a bar or party), you can use "Hey" or "What's up?". Very informal. Also, between people who see each other everyday, and between whom greetings are exchanged quite often, the 'good' in "Good Morning" is omitted. Hope that helps.

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