Sentence structure AI Prompts

14 free sentence structure prompts for ChatGPT, Claude, and Gemini. Every template ships with smart variables, ready to copy or run directly in the AgentDock editor.

Run-on Sentence Fixer

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.

writing run-on sentences comma splice+2

Writing

198 uses

Sentence Fragment Fixer

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.

writing sentence fragments grammar editing+2

Writing

191 uses

Compound Subject and Predicate Identifier

Tag every compound subject and compound predicate in a passage, quote the words forming each one, and apply the clause and agreement tests.

writing compound subject compound predicate+2

Writing

159 uses

Active and Passive Voice Converter

Find every passive-voice sentence in a passage, name the missing actor, and rewrite it in active voice, or convert active sentences to passive.

writing active voice passive voice+2

Writing

152 uses

Appositive Identifier

Identify every appositive in a passage and determine whether it needs commas using the essential versus nonessential removal test.

writing appositives comma rules+2

Writing

147 uses

Coordinating Conjunction Identifier

Identify every coordinating conjunction in a passage, quote what it joins, and apply the correct comma rule for independent clauses versus phrases.

writing coordinating conjunction comma rules+2

Writing

128 uses

Participle Identifier

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.

writing participles verb forms+2

Writing

117 uses

Prepositional Phrase Identifier

Identify every prepositional phrase in a passage, classify each as adjective or adverb, and flag subject-verb agreement traps like 'one of the boys'.

writing prepositional phrases grammar+2

Writing

102 uses

German Grammar Basics Practice Generator

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.

education german word order verb second rule+2

Language

100 uses

Subject-Verb Agreement Checker

Check writing for subject-verb agreement errors, name the rule that applies, and produce corrected sentences covering intervening phrases and collective nouns.

writing subject verb agreement grammar rules+2

Writing

97 uses

Independent Clause Identifier

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.

writing independent clause dependent clause+2

Writing

95 uses

Clause vs Phrase Explainer

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.

writing clauses and phrases grammar+2

Writing

77 uses

Direct and Indirect Object Identifier

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.

writing direct object indirect object+2

Writing

73 uses