He was standing behind the castle.

He was wearing a pendant in the shape of a skull around his neck.

He met a person on the road.

He started cutting trees to make an abatis.

Semiotics is the study of the meaning and use of signs and sign systems.

I am learning Russian at university.

Graph theory is a branch of mathematics that studies the structure of networks.

He is majoring in logic at university.

She made the decision to abort the fetus to protect her own body and future.