There are four adjectives in the sentence, including red, sharp, old, and oak. An adjective is a word that describes or modifies a noun in a sentence. The adjective plays detective and searches for information concerning the subject, which would include shape, size, and origin.
Adjectives answer the reader’s question about how many, which one, and what kind? There are three articles in the sentence, and they are the word law which appears twice and the word a which seems one time. When diagramming a sentence, it is essential to be able to separate adjectives from the articles. When you read the sentence, there should be adjectives to keep the reader engaged.