Sentences can be generated from a grammar by the following procedure:

• Start with the sentence symbol, <S>.

• Repeat until no nonterminal symbols remain:
  • Choose a nonterminal symbol in the current string.

  • Choose a production that begins with that nonterminal.

  • Replace the nonterminal by the right-hand side of the production.

<S>
<NP> <VP>
<ART> <NOUN> <VP>
THE <NOUN> <VP>
THE DOG <VP>
THE DOG <VERB> <NP>
THE DOG <VERB> <ART> <NOUN>
THE DOG <VERB> THE <NOUN>
THE DOG BIT THE <NOUN>
THE DOG BIT THE BOY

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