I have some grammar questions about 'there'

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May 4, 2012 12:46
i suddenly have some questions about 'there'

in my book

There is (the book) on the desk
There was (John's book) under the piano.
There was (my book) in the classroom
There was (John) under the chair
There was (he) in the seminar

All of sentences are 'x'
I hope to understand it.