"How do you feel?" is the most common way to ask someone how they are feeling in English. It's a simple question that can be used in a variety of situations, such as when you meet someone new or when you want to check in on a friend who you haven't spoken to in a while.
If you want to sound more formal or polite, you can say "May I ask how you are feeling today?" instead. This version of the question is usually used in more professional or business settings, where it's important to be respectful and considerate of other people's feelings.
Another way to express how someone is feeling is by using adjectives or phrases that describe their mood or emotions. For example, you might say "You seem really happy today" if someone is smiling and having a good time. Or you could say "I can tell you're feeling upset about something" if someone seems sad or angry.
Of course, there are many other ways to ask someone how they are feeling, depending on the context and the relationship between the two people. But the most important thing is to be sincere and attentive when asking this question, so that you can show your care and support for others.