Words such as "oh", or "wow", which are used to indicate an isolated emotion on the part of the speaker, without an explicit grammatical relationship to the rest of the sentence.

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“Good bye”, “Bye”, “Bye bye”

I'm a non-native English speaker and sometimes it's hard for me to pick up the right word in some situations. Could you, please, explain when it's better to use "goodbye" for ending a conversation, ...