It is important for each person to fulfill their role.

Changes in the social system inevitably occur with time.

I went to see a movie by myself.

Watching a movie alone is enjoyable.

This system is necessary to maintain social fairness.

That man is my father.

He pointed at the location on the map.

Polyandry refers to the social system where one woman is married to multiple men.

This problem has multiple answers.

He is deeply interested in social issues.