He is working hard to construct a new house.

He is learning the basics of mathematics.

He is an expert in sociology.

Marx's theory laid the foundation of sociology.

He is an expert in theoretical physics.

He is good at explaining that theory.

He is known as a person with learning.

We should take responsibility as part of society.

I am very interested in sociolinguistics.

He is deeply immersed in the study of Marxism.