Uses of "Hey" in English
The word "hey" can be used in two ways in English:
As a greeting: "Hey" is a casual way to say hello. You use it with friends or people you know well or feel comfortable with.
For example, "Hey, what’s up?"
As an exclamation: "Hey" can also show surprise or to get someone’s attention.
For example, "Hey! Look out!"
As a filler word:
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