He is studying the history of the conquest of barbarians.

The population is increasing rapidly.

In this damp environment, there is a high possibility that bacteria will proliferate.

Let's calculate the truth value of this logical expression.

He knocked on the door over and over again.

He worked for three nights in a row.

Would you like to go to the movies tonight?

Mr. Ban is my best friend.

This is the latest version of the software.

He fell into a critical state of life due to an accident.