いいえ、それは私の本ではありません。

N5 いいえ iie no N5 それ sore that, that one N5 私 watashi I N5 本 hon book N5 では dewa then, well, in that case

N4 私 shi / watakushi, watashi private, I, me N5 本 hon / moto book, present, main

N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N5 〜で de Indicates where an action happens, means used, tool, cause, or material depending on context N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information