The word Louis can be dramatized somewhat into a kind of invocation, as—O Louis, you may keep the book and so on. Vocatives can almost always be identified by trying the exclamatory O before them.
In the sentence,
Little Harry, only three years old, has cleaned the whole blackboard.
only three years old is an attributive of Harry. It should be torn off and placed in the space marked Attributive.
Series III
(Simple sentences with two or more modifiers of the same kind)
The roll contains the following sentences in sections which may be read and torn off one after the other as the child unrolls the strip:
—The child sleeps and dreams.
—Everybody likes fruit and flowers.
—He took paper, pen and ink to write to his friends.
—Charles opened and closed the book.
—The doctor and the father left the sick child's room.
—The women recommended calmness, patience and prudence.
—In the beginning God created heaven and earth.
—He will always have money and friends.
—In the street we could see crowds of men and a few women.
Series IV
(Elliptical sentences with subject understood)
[This situation does not however arise in English, which, save in the imperative, always requires at least a pronominal subject for the verb.]
Here, the child interprets the sentence, completing it and finding the element that is lacking.