Principle B is a statement in the government and binding theory of syntax that applies to referring expressions -- that is, pretty much any noun-phrase that is not an anaphor or pronoun (which are covered by principles A and B respectively).


*Shei saw the womani

       /  \
    NP    VP
    /    /  \
   N     V    S
 she  said  / \
           NP   VP
          /    /  \
         N    V    S
      Bill thinks / \
                NP   VP
                /    / \  
               N    V   NP
          George saluted \
*Shei said Bill thinks George saluted Maryi

A referring expression must be free.

See Principle A for important context.

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