He was demoted at the company.

He was a true revolutionary, aiming for social reform.

He pushed the revolving door and entered the building.

His elative is respected by the other members.

He prepared himself for the exam.

On a hot day, crushed ice is the best.

Many tourists are coming and this area is very lively.

He lost his sense of taste because he caught a cold.

The corners of his mouth lifted, and he smiled happily.

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