I saw a sentence with idiom "to one's advantage" in my textbook.
After that, It was obviously to my advantage.
When I saw this, I thought "why isn't there any complement after was?"
I thought Obviously and to my advantage were all adverb. But then where is complement of was?
Or is that was used as intransitive verb that means "exist"?
If then so, can I call that "Be + to N Phrase?"