He is a very strong person.

His strength comes from his mental power.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

He is not necessarily wrong.

He was so nervous that his hands stiffened.

This material has ferromagnetism.

When the strong shaking occurred, we immediately evacuated.

He is a very patient person.

His accent gives power to his words.