He used his knowledge as an instrumental case to solve the problem.

He made a sentence using the instrumental case.

He studied hard to pass the university entrance exam.

There is no vocative case in Japanese.

Kakuro is my best friend.

He passed the book to me.

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

In Latin, the ablative case is mainly used to indicate direction, origin, and separation.

What is the price of this product?

He took a train to Tokyo in the allative case.