On "Object" in English

Let's talk about double objects and object clauses here.

Personally, I think double objects refer to direct objects and indirect objects. For example:

I gave him a bag. He is an indirect object. Bao is the direct object. Here, he and his bag are objects. He and a bag are both incomplete sentences. Not "I gave it to him", but "I gave someone a bag". Therefore, what matters is "Bao", not "He", and who is the direct guest and who is the indirect guest. Generally, the direct object is a thing, and the indirect object is a personal pronoun.

An object clause is a clause that acts as an object.

I know you are the girl.

Who acts as the object of understanding.

Object complement is a supplementary component, and its component acts as the object of the sentence. As for the example, I didn't learn it well myself, sorry. I hope the above is useful to you.