He reacknowledged his own mistakes.

Epistemology is the philosophical study of the origin, nature, and scope of knowledge.

He had a hard time finding his dog's tag.

He lost everything.

She is planning a date with her current boyfriend.

Everyone was surprised by the news.

My boyfriend gave me a gift.

His nature is very kind.

Detailed information is needed to understand the nature of that project.

I was moved by his sincerity.