Sentence Diagram Generator: Build Reed–Kellogg Diagrams

Open an example or type your own sentence parts into the fields, and the Reed–Kellogg diagram updates as you edit. Word coverage checks, student worksheets, teacher answer keys, and SVG or PNG downloads need no account. Exports carry no watermark, and rendering runs in your browser.

Enter the subject, verbs, objects or complements, and modifiers in their fields. The tool arranges the Reed–Kellogg lines automatically, but it does not parse sentences or choose grammatical roles for you. Start from an example, revise the parts, and review your analysis before you download.

Use a Reed–Kellogg diagram to show grammatical functions and a syntax tree to show phrase hierarchy. The diagram arranges words as subject, verb, object, complement, and modifier. A constituency tree uses branches such as S, NP, and VP. For a tree, open the Syntactic Tree Generator above.

It supports one simple subject, one or two predicates, action or linking verbs, objects or subject complements, modifiers, and up to four prepositional phrases. Embedded clauses, compound subjects, questions, and infinitives are not supported. Two predicates sharing one subject are not the same as a compound sentence with independent clauses.

Enter the preposition and its object, then pick a subject, verb, or existing object or complement in the Modifies menu. The diagram connects the phrase to that part. Choose the attachment that fits your sentence’s meaning. Some sentences allow more than one reading, and the editor does not pick for you.

Choose Action for a direct object, such as book in The teacher gave students a book. Choose Linking for a subject complement, such as blue in The sky is blue. The generator draws a vertical divider for an object and a backward-slanting divider for a complement.

Word coverage compares your optional original sentence with your diagram fields. It counts repeated words individually and flags words not assigned and extra occurrences, ignoring punctuation and capitalization. A matching count does not prove the grammar is correct, so review the roles and phrase attachments yourself before sharing.

Choose Student worksheet to get numbered spaces, with an optional alphabetical word bank. Repeated entries stay in the bank, and an original sentence becomes the exercise prompt. Download SVG or PNG, then switch to Teacher answer key for matching numbered answers. Both versions come from your input and are not checked for grammar.