It's difficult to calculate the area of this hexagon.

He drew a decagon shape.

He was drawing an enneagon shape.

Nanamiko is my best friend.

I wake up at seven o'clock every day.

Mr. Nanatani is my best friend.

My younger sister is seventeen years old.

Let's have a barbecue with a shichirin tonight.

It's very interesting to learn about the Seven Wonders of the World.

My grandfather is seventy years old.