He was observing the movement of the pendulum.

An imaginary number, or 'kyosu', is not a real number, but refers to a number whose square root is a negative number.

He recognizes the danger of extremism.

He calls himself a communist.

Please be careful when crossing the road.

I am moving to Kitamoto next week.

Mr. Kiguchi is my best friend.

This timber is rated as having good lumber grade.

Her smile is very natural, and it soothes the heart.

His singing voice hit my heart heartwrenchingly.