1. Can you greet the person you meet for the first time in English?

2. What is the relationship between the people who greet each other?
3. Can you introduce your friend and answer the question in English?
4. Who and who are being introduced?
--------------------------------
Are the expressions all grammatical?
If there are any wrong expressions, would yoi correct them?

The first three sound fine. The fourth one, though, should just be one of these:

To which people are you being introduced?
To whom are you being introduced?
To whom is he being introduced?
To whom are they being introduced?
etc.

Thank you!

e.g. Tom and Bill are being introduced.

In this case, if we do not know the people who are being introduced, can't we ask,"Who and who are being introduced?"

No, you'd just say something like this:

Who is being introduced to whom?

"Who and who" is not done.

1. Yes, you can greet a person you meet for the first time in English. Some common greetings include "Hello," "Hi," "Nice to meet you," or "How are you?"

2. The relationship between people who greet each other can vary. It could be between friends, colleagues, acquaintances, family members, or even strangers. The context and the level of familiarity usually determine the nature of the relationship.

3. Certainly, I can help you introduce your friend. Please provide me with the information or details you would like to include in the introduction.

4. In order to answer the last question, I would need clarification on who exactly is being introduced. If you can provide the names or specific details about the people being introduced, I can then give you a more accurate response.

Regarding the grammar, the expressions you used in questions 1 and 2 are grammatically correct. However, in question 3, there is a minor error. The correct phrasing would be: "Can you introduce your friend and answer the question in English?" I hope this helps!