Hello "Hello" is used widely in many countries to greet people. Hello can be used: To greet everyone in any situation. To greet a group of people. To greet during handshakes and introductions. To greet casual friends. To greet colleagues and customers. Hi "Hi" is used as a friendly greeting. Hi can be used: To greet friends. To greet people intimate and close to you. To greet people in casual, fun filled surroundings (like family events, parties,) To greet new people during friendly, casual introductions. "Hi" is used widely in American English, to attract a person's attention. Good Morning "Good Morning" is used as a formal or respectful greeting. Good Morning is used: To greet colleagues, seniors at work place. To greet a group or team of people. To greet a group of listeners at a speech. To greet new people during formal, business introductions. To greet customers. ...
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