That topic is very interesting.

I attended the meeting as his surrogate.

This old book has an epigraph and a colophon written by the author himself.

She gave birth to a child as a surrogate mother.

His style of music reminds me of the 70s.

He expanded the company in one generation.

Their opinions are roughly the same.

He did not paint his own pictures, but had them done by others.

He wrote an essay for me.

He spoke for me.