This is an old Japanese textbook that explains the usage of '變格' in detail.

He always acts according to his own maxim.

I love fighting games.

He is deeply studying the concept of hypostasis in theology.

There is no ergative in Japanese.

Where is Kakushu?

Japanese is a language with few declensions.

There is no oblique case in Japanese.

The passive form in Japanese is used differently from English.

This quadrilateral is a square.