It is common to say "hey" in greeting situation? I thought "hey" is only used to call others and grab their attention.
Yes, it is common to use "hey" as a greeting, however, it is very casual. So "hey" is generally only used between friends or between two people who are familiar and have a casual way of speaking with each other. Ex: Hey! How's it going? Ex: Hey, long time no see! What's up?
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