Why do the pictures say English subject complement? Shouldn't it be an English adverbial? It means accompaniment and so on, and the learned subject complements are all after the copula.

Classmate, is this the current English textbook? It's complicated He, the child of a poor farmer, was born in. The president of the United States died. Actually, they are two appositives. He, the child of a poor peasant family, is the same person as the President of the United States. It is not strict to say that the Lord makes up for it.