1. Hey, Hey man, or Hi
You can use “hey” and “hi” to greet someone instead of “hello”. Both are particularly popular among younger people. While “hi” is appropriate to use in any casual situation, “hey” is for people who have already met. If you say “hey” to a stranger, it might be confusing for that person because he or she will try to remember when you met before! You can also add “man” to the end of “hey” when greeting males. Some people also use “hey man” to casually greet younger women, but only do this if you know the woman very well. Remember that “hey” doesn’t always mean “hello”. “Hey” can also be used to call for someone’s attention.
2. How’s it going? or How are you doing?
These are casual ways of asking “how are you?” If you’re trying to be particularly polite, stick with “how are you?” but otherwise, you can use these expressions to greet almost anyone. The word “going” is usually shortened, so it sounds more like “go-in”. You can answer with “it’s going well” or “I’m doing well” depending on the question. Although it’s not grammatically correct, most people just answer “good” – and you can too. Like when responding to “how are you?” you can also follow your answer by asking “and you?”.
3. What’s up?, What’s new?, or What’s going on?
These are some other informal ways of asking “how are you?” which are typically used to casually greet someone you have met before. Most people answer with “nothing” or “not much”. Or, if it feels right to make small talk, you could also briefly describe anything new or interesting that’s going on in your life, before asking “what about you?” to continue the conversation.
4. How’s everything ?, How are things?, or How’s life?
These are some other common ways of asking “how are you?” They can be used to casually greet anyone, but most often they’re used to greet someone you already know. To these, you can answer “good” or “not bad”. Again, if small talk feels appropriate, you could also briefly share any interesting news about your life, and then ask the person “what about you?” or another greeting question.
5. How’s your day? or How’s your day going?
These questions mean “how are you?” not just right now, but how you’ve been all day. You would use these greetings later in the day and with someone you see regularly. For example, you might ask a co-worker one of these questions in the afternoon, or a cashier that you see at the grocery store every evening. “It’s going well” is the grammatically correct response, but many people simply answer with “fine”, “good” or “alright”. By the way, notice that “good”, “fine” or “not bad” are perfect answers to almost any greeting question.
6. Good to see you or Nice to see you
These casual greetings are used with friends, co-workers or family members that you haven’t seen in a while. It’s common for close friends to hug when they greet each other, particularly if they haven’t seen each other in some time; so you might use this greeting along with a hug or handshake depending on your relationship with the person.
7. Long time no see or It’s been a while
These casual greetings are used when you haven’t seen someone in a long time, particularly if you meet that person unexpectedly. How much is a long time? It depends on how often you normally see that person. For example, you could use one of these greetings if you normally see the person every week, but then don’t see them for a few months or more. Usually, these phrases are followed with a question like “how are you”, “how have you been?” or “what’s new?”
8. Good morning, Good afternoon, or Good evening
These are formal ways of saying “hello”, which change depending on the time of day. Keep in mind that “good night” is only used to say “good bye”, so if you meet someone late in the day, remember to greet them with “good evening”, rather than “good night”. Good morning can be made more casual by simply saying “morning”. You can also use “afternoon” or “evening” as informal greetings, but these are less commonly used.
9. It’s nice to meet you or Pleased to meet you
These greetings are formal and polite. If you say this to someone when you meet him or her for the first time, it will make you seem courteous. Remember to only use these greetings the first time you meet someone. Next time you see the person you can show that you remember him or her by saying “it’s nice to see you again”.
10. How have you been?
This greeting question is only asked by people who have already met. If someone asks you “how have you been?” they want to know if you have been well since the last time the two of you met.
11. How do you do?
This greeting is VERY formal, and quite uncommon, but it may still be used by some older people. The proper response is “I’m doing well” or, as strange as it seems, some people even ask “how do you do?” right back as an answer.
thank you, hopefully useful