how to recognise noun, adjective and adverb clause?

Adjective clause:

Adjective clauses modify nouns or pronouns, these follow the noun or pronoun. Most adjective clauses begin with who, whom, which or that, these may specifically not be in the sentence but will certainly be implied.

Adverb clause:

Adverb clauses modify verbs in which case they may appear anywhere in the sentence. They tell why, where, under what conditions or to what degree the action occurred or situation is existent. 

Noun clause:

Noun clauses do not modify, they are not subordinates in the sentence like adjectives or adverbs. They function within another sentence pattern as nouns. It works as a subject, subject complement, direct object or object of a preposition. A noun clause usually begins with a relative pronoun like that, which, who, whoever, whomever, whose, what and whatsoever.