(1) You have asked a very important and difficult question that
cannot be explained fully in a single post.
(2) I respectfully suggest that you review the definition of "noun,"
"adverb," and "adjective." Then it will be easier to understand.
(3) Basically, "clause" means something like "sentence." It has a
subject and a predicate (verb).
(3) A noun clause acts like a noun.
"I know something." "Something" is a noun. I can
replace "something" with a clause (sentence). For example,
"I know (that) you did it. Therefore, we call "you did it" a
noun clause. (It is not necessary to introduce most noun
clauses with "that," but it is a good idea in formal writing.)
(4) An adverb/adverbial clause acts like an adverb.
I study English because it is the international language.
(It tells WHY I study English.)
I will visit you if your wife serves a delicious dinner.
(It tells UNDER WHAT CONDITIONS I will visit you.)
(5) An adjective/adjectival clause acts like an adjective.
"The woman who has blonde hair is very popular."
(Who has blonde hair tells you which woman is popular.)
"I saw the movie that everyone is talking about."
(That everyone is talking about tells you which movie I saw.)
People are waiting to help.
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