In ancient times, ministers had to stand before the emperor to report important matters.

He didn't know about that thing.

The emperor stands at the highest position in the country.

Once upon a time, there was a big castle in this place.

Health is very important.

His opinion is very important.

Your cooperation is needed for this project.

I need you.

In the past, we used to play in the park every day.

Once, we used to play in the park every day.