Breakdown of kore ha hon zya nai desu.
ですdesu
to be
はha
topic particle
本hon
book
これkore
this (one) pronoun
じゃ ないzya nai
it is not the case
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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita
Hepburn romanizationwatashi wa chuugoku kara kimashita