My grandfather is already sixty years old.

He has been living in this town for several decades.

He drew a decagon shape.

His company made a profit of one billion yen.

My pet Bengalese finch is very cute.

We have been working on this project for ten months.

We should always remember the power of Kannon in difficult times.

The era of the Five Good Emperors is considered the golden age of the Roman Empire.

He played a perfect fifth scale on the piano.

The godan conjugation verbs are the basic verb forms in Japanese.