He was studying with his nerves on edge the day before the exam.

His reflexes are very sharp.

When the sympathetic nerves are activated, the heart rate increases.

He lost consciousness due to the effects of nerve gas.

By chance, he met my old friend.

In the early morning, he brewed coffee and started his day.

He completed the project in a week.

I'm always busy during the daytime, and I only have time to rest at night.

He had been working overseas for an extended period of time.

The theory of spacetime is an important part of physics.