He is learning the art of painting.

He solved the problem using that technique.

He defeated the enemy using that technique.

He is interested in necromancy.

She said she was interested in spiritualism.

I am doing volunteer work to contribute to the community.

He was watching the situation as a detached observer.

His contribution led our project to success.

He became my guardian.

She is entrusted with the guardianship of the elderly.