1·Subject, predicate, object, objective complement, attribute, adverbial modifier, predicative, appositive.
主语，谓语，宾语，宾语补足语，定语，状语，表语，同位语。
2·An appositive is a noun or pronoun that renames another noun or pronoun. Appositives are placed directly after the noun or pronoun they identify.
同位语为名词或代名词，同位语直接放在想定义的名词或代名词后面。
3·What's the difference between relative clauses and appositive clauses?
让学生思考同位语从句与定语从句的差异。