Everyone was surprised by the news.

I am planning to go to Inner Mongolia, an autonomous region of China, next week.

I have been to Outer Mongolia.

I have been to Chicago.

The Paleogene period was a very important time in the history of the Earth.

The passive form in Japanese is used differently from English.

This quadrilateral is a square.

By learning the imperfective form, you can understand Japanese grammar more deeply.

Please tell me the singular form of this word.

In English, adding 's' after a noun makes it a plural form.