"How do you do?" is just what the title of your question is: a greeting. It is not really a question as its form would make one think. The only correct response to "How do you do?" is "How do you do?"
"How do you do?" is a formal greeting. It is spoken when two people meet each other for the first time. That's it. After that first meeting, the two people never again exchange the words "How do you do?" "How do you do?" acknowledges the existence of the other person, but does not call for information. _______
Here's an example:
Mr. Green: Bob Smith, I'd like you to meet Tom Jones.
Bob Smith: How do you do, Tom (or Mr. Jones)?
Tom Jones: How do you do, Bob (or Mr. Smith)?
Bob Smith: It's a pleasure to meet you. I've heard a lot about you.
Tom Jones: I've heard a lot about you, too..... _____
Here's a different situation:
Sally: Hi, Beth!
Beth: Hi, Sally! How are you?
Sally: Great! What about you?..... ______
"How do you do?" is not meant to elicit information from the hearer, but an acknowledgement. "How are you?" requests some information, which the hearer gives. _______ Rachel
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