A new system has been introduced.

I think his inclination is a bit unusual.

Last night, when I looked up at the sky, a meteor suddenly streaked across.

Ryusei is my best friend.

He deeply reflected on his actions.

He was reflecting on his actions.

I will never forget the days of my youth.

When I looked up at the night sky, I could clearly see the Big Dipper.

A new law has come into being.

A new law has come into being.