The Reed-Kellogg System
Simple sentences in the Reed-Kellogg system are diagrammed in accordance with the following basic schemata:
The diagram of a simple sentence begins with a horizontal line called the base. The subject is written on the left, the predicate on the right, separated by a vertical bar which extends through the base. The predicate must contain a verb, and the verb either requires other sentence elements to complete the predicate, permits them to do so, or precludes them from doing so. The verb and its object, when present, are separated by a line that ends at the baseline. If the object is a direct object, the line is vertical. If the object is a predicate noun or adjective, the line looks like a backslash, \, sloping toward the subject.
Modifiers of the subject, predicate, or object dangle below the base line:
Adjectives (including articles) and adverbs are placed on slanted lines below the word they modify. Prepositional phrases are also placed beneath the word they modify; the preposition goes on a slanted line and the slanted line leads to a horizontal line on which the object of the preposition is placed.
These basic diagramming conventions are augmented for other types of sentence structures, e.g. for coordination and subordinate clauses.
Read more about this topic: Sentence Diagram
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