Question

don't build castle (in the air) in the air is direct /indirect object, object of preposition, subject compliment,object compliment ​

Answer 1

Explanation:

The subject complement is normally a noun or an adjective that defines or renames the subject in some way. Object complements follow and modify a direct object and provide additional information about it. An object complement can be a noun or adjective or any word acting as a noun or adjective