clauses and phrases?

Question

"i know why the caged bird sings..."


that is the sentence, the clause is "why the caged bird sings" would it be an adverb or adjective clause?

Answer 1

It's a noun clause.

Compare it to this sentence:
"I know information."
"Information" is a noun, right?
So something that takes the same position in the sentence as a noun is a noun clause.
If you think about it, this clause is the direct object of "know". It makes sense that a direct object would be a noun clause.

Answer 2

Looks like an adverb clause. "Why the caged bird sings" doesn't describe "I know".