He seriously reflected on his actions.

He reflected seriously on his actions.

He continues to search for the secret of longevity.

He vowed eternal love to her.

He made a vow of eternal love to her.

When I compared heights with him, I was a little taller.

He found it difficult to control his sexual urges.

He made a bronze sculpture.

Understanding the traits of cats is important for building a good relationship with them.

He decided to establish a new political party.