He started cutting trees to make an abatis.

I am learning Russian at university.

He is majoring in logic at university.

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

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

In ancient Japan, when the emperor's procession passed through the town, everyone showed respect.

His lie was exposed.

His lie was exposed by himself.

When he failed, I said 'serves you right'.

He rolled the dice and got the same number on all.