---
title: "Grammar checker AI Prompts (6 Free Templates) - AgentDock"
description: "6 free grammar checker 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/grammar-checker"
docs_index: /llms.txt
---

# Grammar checker AI Prompts (6 Free Templates) - AgentDock

6 free grammar checker templates, including Who vs Whom Explainer and Then vs Than Explainer.

- [Who vs Whom Explainer](https://agentdock.ai/prompt-library/writing/who-vs-whom-explainer.md): Find every who and whom in a text, correct mismatched grammatical roles, and prove each call with the he-or-him substitution test.
- [Then vs Than Explainer](https://agentdock.ai/prompt-library/writing/then-vs-than-explainer.md): Find misused then and than in writing, verify a single sentence, and explain the comparison-versus-sequence test that keeps the two words straight.
- [Who's vs Whose Explainer](https://agentdock.ai/prompt-library/writing/whos-vs-whose-explainer.md): Explain whether who's or whose fits a sentence, prove the call with the who-is expansion test, and cover whose for non-person owners like companies.
- [Verb Tense Consistency Checker](https://agentdock.ai/prompt-library/writing/verb-tense-consistency-checker.md): Find verbs that break a passage's dominant tense, name the anchor tense, and correct inconsistencies while recognizing legitimate shifts like dialogue and flashbacks.
- [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.
- [There, Their, and They're Explainer](https://agentdock.ai/prompt-library/writing/there-their-theyre-explainer.md): Find there, their, and they're mistakes in writing, prove each fix with a test, and explain the three-way difference using expansion and ownership tests.

## Related tags

- [Writing](https://agentdock.ai/prompt-library/t/writing.md)
- [Commonly confused words](https://agentdock.ai/prompt-library/t/commonly-confused-words.md)
- [Grammar rules](https://agentdock.ai/prompt-library/t/grammar-rules.md)
- [Possessive pronouns](https://agentdock.ai/prompt-library/t/possessive-pronouns.md)
- [Word choice](https://agentdock.ai/prompt-library/t/word-choice.md)
- [Spelling rules](https://agentdock.ai/prompt-library/t/spelling-rules.md)
- [Sentence structure](https://agentdock.ai/prompt-library/t/sentence-structure.md)
- [Homophones](https://agentdock.ai/prompt-library/t/homophones.md)