We need a change in the education system.

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.

I have been involved in the planning of a new project.

We are actively participating in this project.

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.