+370.+ You will notice that these adjective clauses are introduced by
the relative pronouns _who_, _which_ and _that_. These relative pronouns
fulfil something of the office of a conjunction, because they are
serving as connecting elements; they join these subordinate clauses to
the words which they modify. But you will note, also, that these
relative pronouns not only serve as connecting elements, but they also
play a part in the subordinate clause, as either the subject or object.
For example:
The man who has no education is handicapped in the struggle.
Are these the books that you ordered?
In the first sentence, _who has an education_ is an adjective clause
modifying the noun _man_, introduced by the relative pronoun _who_,
which is also the subject of the verb _has_.
In the second sentence, _that you ordered_ is an adjective clause,
modifying the noun _books_, introduced by the relative pronoun _that_,
which is also the object of the verb _ordered_.
+371.+ There is no need to be confused in this matter of clauses. If the
clause is used as a noun, either as the subject or the object or in any
other way in which a noun can be used, it is a noun clause. If it is
used as an adverb and will answer any of the questions _why_, _when_,
_where_, or _how_, etc., it is an adverb clause. If it is used as an
adjective,--if it modifies a noun or pronoun,--it is an adjective
clause.
You will note that the only way in which a noun is used that does not
have its corresponding clause is as a possessive. We do not have
possessive clauses. The clause used as an adjective always modifies a
noun or pronoun.
+372.+ +An adjective clause is a clause used as an adjective and hence
always modifies a noun or pronoun.+
An adjective clause may be introduced by the relative pronouns, _who_,
_which_ or _that_. The use of this clause is a great help to us in the
expression of our ideas, for it enables us to combine several sentences
containing related thoughts into one sentence so we have it all
presented to the mind at once.