What is the role of this clause in this sentence?

It completes the meaning of the adjective surprised, so I would call it an adjective complement.

And what parts of speech is this? a noun clause? an adverb clause? In my understanding adverbs are ought to be the modifiers for adjectives. But then, this is a complement which is a whole different area. If I ask the question, "what are you surprised about?" then it would make this clause like a noun clause, acting as direct object. Am I correct?

But then there is that question, "why are

VjeanAnd what part of speech is this?

The term part of speech is not appropriate here. Part of speech applies only to one word at a time.

Vjeana noun clause? an adverb clause?

It’s neither; it’s a complement clause.

VjeanIf I ask the question, "

Aren't adverbs supposed to address questions such as how, why, when? Thus, with the given sentence, "I am happy that it's finally here", I perceived the clause, (...that it's finally here) logically being an adverb clause, answering, 'why are you happy?' The same with, "I am happy that you've declined the offer." Again, the question "why are you happy?" could only be answered by an adverbial-

For that it’s finally here to be adverbial, it would have to change the meaning of the adjective happy, and it doesn’t; rather, it completes the meaning by telling us what you are happy about. Does that make more sense to you?

What do you mean by "it would have to change the meaning of the adjective 'happy'"? I guess I am trying to find the appropriate classification for this clause in terms of "parts of speech". I appreciate your time Apara Gus and thanks again.

VjeanWhat do you mean by "it would have to change the meaning of the adjective 'happy'"?

I mean what I said. In other words, it can’t be an adverbial because it does not modify (change the meaning of) the adjective, as an adverb would; it completes the meaning of the sentence. I don’t think I can explain it any clearer than that.

Hi. I looked around the web and found these addresses to have contained topics about adjective complements. It seems that it could go either way, being a noun clause or being an adverb clause. Thanks a lot.

http://grammar.yourdictionary.com/parts-of-sp

For some reason, the web addresses don't display. Anyway, it is in grammar.yourdictionary.com and there is a thread about this in usingenglish.com