Everyone is born equal, equal是adj當受補 原來受詞one被移去當句子主詞,受補留原地(不懂??)類似的寫法We made him king.（主動） He was made king.（被動）可否再解釋?

你列出的两個例句,在文法上是屬於不同的範疇:
1. secondary predication
e.g. Everyone is born equal.   (equal 是adj 當受補 .... X)
= Everyone is equal when (he/she is) born.
"equal", a predicative adjective as subject complement (平等的不是媽媽!), is the second predicate of the sentence.
2. "make" as a transitive verb of incomplete predication
e.g. We make him king.  He was made king.
"king" is the object complement to "him" in the sentence.