He is an expert in orthoepy, teaching pronunciation.

He is an expert in planetary science.

Geopolitics is the key to understanding important aspects of international relations.

Let's try to predict tomorrow's weather using the future tense.

The present tense is used to express things that are happening now or general facts.

Wasei-eigo is a unique way of expression in Japan.

Hygiene is very important for maintaining health.

Good Friday is an important holiday in Christianity.

The man named Yasushi, true to his name, was a person who loved peace very much.

Life is like a long journey.