to classify them and give the reasons for the classification.

To prepare the pupil thoroughly for this work, the teacher will find it
necessary to explain why such words as _music, mathematics, knowledge_,
etc., are common nouns. _Music, e. g._, is not a proper noun, for it is not
a name given to an individual thing to distinguish it from other things of
the same class. There are no other things of the same class--it forms a
class by itself. So we call the noun _music_ a _common_ noun.

CLASSES OF PRONOUNS.

The speaker seldom refers to himself by name, but uses the pronoun _I_
instead. In speaking _to_ a person, we often use the pronoun _you_ instead
of his name. In speaking _of_ a person or thing that has been mentioned
before, we say _he_ or _she_ or _it_. These words that by their _form_
indicate the speaker, the hearer, or the person or thing spoken of, are
called +Personal Pronouns+. See Lesson 19, "Hints."

Give sentences containing nouns repeated, and require the pupils to improve
these sentences by substituting pronouns.

When we wish to refer to an object that has been mentioned in _another_
clause, and at the same time to _connect the clauses_, we use a class of
pronouns called +Relative Pronouns+. Let the teacher illustrate by using
the pronouns _who, which_, and _that_. See Lesson 57, "Hints for Oral
Instruction."

When we wish to ask about anything whose _name is unknown_, we use a class
of pronouns called +Interrogative Pronouns+. The interrogative pronoun
stands for the unknown name, and asks for it; as, _Who_ comes here? _What_