---
title: "Sentence structure AI Prompts (14 Free Templates) - AgentDock"
description: "14 free sentence structure prompts for ChatGPT, Claude, and Gemini. Professional templates with smart variables. Copy and use instantly, or run them in the AgentDock editor."
url: "https://agentdock.ai/prompt-library/t/sentence-structure"
docs_index: /llms.txt
---

# Sentence structure AI Prompts (14 Free Templates) - AgentDock

14 free sentence structure templates, including Run-on Sentence Fixer and Sentence Fragment Fixer.

- [Run-on Sentence Fixer](https://agentdock.ai/prompt-library/writing/run-on-sentence-fixer.md): Find every run-on sentence and comma splice, explain why each is an error, and rewrite it correctly with a period, semicolon, conjunction, or subordination.
- [Sentence Fragment Fixer](https://agentdock.ai/prompt-library/writing/sentence-fragment-fixer.md): Find every sentence fragment, explain the missing subject, verb, or clause, and rewrite it into a full sentence or join it to a neighboring one.
- [Compound Subject and Predicate Identifier](https://agentdock.ai/prompt-library/writing/compound-subject-predicate-identifier.md): Tag every compound subject and compound predicate in a passage, quote the words forming each one, and apply the clause and agreement tests.
- [Active and Passive Voice Converter](https://agentdock.ai/prompt-library/writing/active-passive-voice-converter.md): Find every passive-voice sentence in a passage, name the missing actor, and rewrite it in active voice, or convert active sentences to passive.
- [Appositive Identifier](https://agentdock.ai/prompt-library/writing/appositive-identifier.md): Identify every appositive in a passage and determine whether it needs commas using the essential versus nonessential removal test.
- [Coordinating Conjunction Identifier](https://agentdock.ai/prompt-library/writing/coordinating-conjunction-identifier.md): Identify every coordinating conjunction in a passage, quote what it joins, and apply the correct comma rule for independent clauses versus phrases.
- [Participle Identifier](https://agentdock.ai/prompt-library/writing/participle-identifier.md): Identify every participle in a passage, labeling present and past forms as adjectives or verb-tense builders, and distinguish them from gerunds and dangling modifiers.
- [Prepositional Phrase Identifier](https://agentdock.ai/prompt-library/writing/prepositional-phrase-identifier.md): Identify every prepositional phrase in a passage, classify each as adjective or adverb, and flag subject-verb agreement traps like 'one of the boys'.
- [German Grammar Basics Practice Generator](https://agentdock.ai/prompt-library/education/language/german-grammar-basics-practice-generator.md): Practice German verb-second word order in main clauses and verb-final order in subordinate clauses introduced by weil, dass, or wenn, plus a case overview.
- [Subject-Verb Agreement Checker](https://agentdock.ai/prompt-library/writing/subject-verb-agreement-checker.md): Check writing for subject-verb agreement errors, name the rule that applies, and produce corrected sentences covering intervening phrases and collective nouns.
- [Independent Clause Identifier](https://agentdock.ai/prompt-library/writing/independent-clause-identifier.md): Finds every independent clause in a passage, quotes its exact boundaries, names its subject and verb, and flags how multiple clauses are joined or mis-joined.
- [Clause vs Phrase Explainer](https://agentdock.ai/prompt-library/writing/clause-vs-phrase-explainer.md): Explain whether each group of words in a passage is a clause or a phrase using the subject-and-verb test, and name the specific type.
- [Direct and Indirect Object Identifier](https://agentdock.ai/prompt-library/writing/direct-indirect-object-identifier.md): Explain and label the direct and indirect objects in a passage, using the verb-plus-what test to separate them from subject complements and prepositional phrases.
- [Sentence Types Identifier](https://agentdock.ai/prompt-library/education/reading/sentence-types-identifier.md): Analyze any sentence or passage to identify its type, simple, compound, complex, or compound-complex by structure, and by purpose

## Related tags

- [Writing](https://agentdock.ai/prompt-library/t/writing.md)
- [Grammar](https://agentdock.ai/prompt-library/t/grammar.md)
- [Grammar editing](https://agentdock.ai/prompt-library/t/grammar-editing.md)
- [Education](https://agentdock.ai/prompt-library/t/education.md)
- [Verb forms](https://agentdock.ai/prompt-library/t/verb-forms.md)
- [Grammar rules](https://agentdock.ai/prompt-library/t/grammar-rules.md)
- [Grammar checker](https://agentdock.ai/prompt-library/t/grammar-checker.md)
- [Dependent clause](https://agentdock.ai/prompt-library/t/dependent-clause.md)
- [Close reading](https://agentdock.ai/prompt-library/t/close-reading.md)