She is learning the grammar of the present progressive form.

He is an expert in international relations.

I am good at calculations.

This book enlightened my thinking.

He roughly carved the wood into shape.

The Great Kanto Earthquake that occurred in 1923 is one of the most damaging earthquakes in Japanese history.

The Great Kanto Earthquake occurred in 1923, and many people were affected by it.

He continues to practice in search of complete enlightenment.

The Third International was a historically important organization.

The Mesolithic is the era between the Paleolithic and the Neolithic.