Epidemiology is the science that studies the occurrence and spread of diseases.

I am majoring in political science at university.

I am majoring in physiology at university.

He likes going to chamber music concerts.

He is in the third year of junior high school, or in other words, he is in the 9th grade in school years.

He has a deep interest in numismatics.

He is majoring in hydrology at university.

She is learning the grammar of the present progressive form.

A tsunami warning has been issued, so please evacuate immediately.

This sentence is written in the present tense.