Kellogg

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The Reed-Kellogg System
Simple sentences in the Reed-Kellogg system are diagrammed in accordance with the following basic schemata:

The diagramof 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. Thepredicate 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, whenpresent, 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, \, slopingtoward 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 isplaced.
These basic diagramming conventions are augmented for other types of sentence structures, e.g. for coordination and subordinate clauses.
-------------------------------------------------Basics of Reed-Kellogg diagrams
I. Subject vs. predicate
To diagram a sentence, you have to divide it into its component parts, or constituents. The most important cut is between subject and predicate,which are separated with a vertical line. The predicate contains the verb marked for tense plus any objects or subjective or objective complements. The predicate always contains a verb phrase.
Theminimal verb phrase is just a verb with tense marking (Pattern VI):
It rained.
That's ridiculous. (Pattern II) 
Alice considered the situation. (pattern VII) 
Alice sent Bob an email. (Pattern...