Volunteered

He was a benevolent old man who volunteered to mow his neighbors' lawns for free.

The students volunteered for community service.

He volunteered to help her.

She volunteered to do the job.

It drew strength from the not-so-young people who braved the bitter cold and scorching heat to knock on doors of perfect strangers, and from the millions of Americans who volunteered and organized and proved that more than two centuries later a government of the people, by the people, and for the people has not perished from the Earth.

She volunteered to go to the meeting with him.

She volunteered to help him.

Tom volunteered to help.

Tom volunteered to do all the things no one else wanted to do.

Tom volunteered a good deal of his time to helping those less fortunate than himself.