Can I use "hey" to call the other even if I don't know that person well enough?
Yes you can! Most people will use "hey" as a way to greet someone or to grab someone's attention. It really depends on how you are using it. If you just say "hey" as a way of getting a stranger's attention, it may come off as rude, depending on the way you say it. It's more polite to just say "excuse me" to get a stranger's attention. However, if you want to just greet a stranger then "hey" is perfectly acceptable! Ex: Hey there! My name is Becca. Ex: Hey, could you tell me where the train station is? Ex: Hey listen. I am having a party tonight. Wanna come?
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