この本はいくらですか。

N5 この kono this N5 本 hon book N5 はい hai yes

N5 本 hon / moto book, present, main

N5 〜か ka Marks a question, alternative, or uncertainty, appears at the sentence end or between options N5 〜です desu Used at the end of a sentence, polite affirmative form, means to be depending on context 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