I often go to see theatrical plays on weekends.

I think this prototype will be useful in developing new products.

I think it's accurate to say that.

The ancient Sarugaku can be said to be the prototype of modern theater.

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

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

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

He tends to hold onto past failures.

In ancient Japan, sarugaku was one of the people's entertainments.

Modern technology is advancing at an astonishing rate.