I'm concerned about his attitude.

I can't rest easy until he comes back.

I can't rest easy when he doesn't come home.

I'm very anxious until he comes back.

It's very interesting to learn about the history of the Netherlands.

The Netherlands is known for its beautiful windmills and tulips.

In old Japan, people used to travel wearing straw sandals.

In the old days, people used to travel wearing straw sandals.

In old Japan, people used to travel wearing straw sandals.

She is good at dancing the waltz.