He feels muscle contractions every day.

He suddenly fell down as his leg underwent a spasm.

This sweater may shrink if you wash it.

This sweater shrinks when washed.

A nuclear submarine can travel underwater for a long time.

The International Atomic Energy Agency is an international organization that promotes the peaceful use of nuclear energy.

This is my unused camera.

My uncle gave me a birthday present.

Everyone was paying their respects in silence.

I mailed a letter at the post office.