日本語

日本語

The Japanese language.

Here, '日本語' is used as a direct object to denote the language of Japanese being spoken.

私は日本語を話します。

I speak Japanese.

In this sentence, '日本語' is used as the object of the verb '学ぶ' to indicate the language being learned.

日本語を学ぶのは楽しいです。

Learning Japanese is enjoyable.

Here, '日本語' is used as the means or medium in which the book is written.

この本は日本語で書かれています。

This book is written in Japanese.