Why do people on the phone say 'This is she' and not 'This is her'?

The answer lies in something called the "predicate nominative."

[audio:http://www.grammarunderground.com/wp-content/uploads/2011/05/0047-This-Is-She-vs-This-Is-Her-Predicate-Nominative-mp3.mp3|titles=0047 This Is She vs This Is Her Predicate Nominative mp3]

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