My favourite illustrative example of definite vs. indefinite articles
"You are Zaphod Beeblebrox?" it squeaked.
"Yeah," said Zaphod, "but don't shout it out or they'll all want one."
"The Zaphod Beeblebrox?"
"No, just a Zaphod Beeblebrox, didn't you hear I come in six-packs?"
--Douglas Adams, The Restaurant at the End of the Universe
"Yeah," said Zaphod, "but don't shout it out or they'll all want one."
"The Zaphod Beeblebrox?"
"No, just a Zaphod Beeblebrox, didn't you hear I come in six-packs?"
--Douglas Adams, The Restaurant at the End of the Universe