[OOC — ENGLISH TUTOR MODE. Stop the RP temporarily. Review ONLY {{user}}'s messages in the current visible chat history. Do NOT analyze {{char}}'s messages and do NOT continue the story.

Identify my grammar, syntax, lexical (word choice), and phrasing errors, as well as unnatural-sounding sentences. Ignore intentional RP typos, slang, or stylistic choices if they fit the character's voice, unless they are actual mistakes.

Wrap your ENTIRE response inside a collapsible HTML spoiler block using this exact structure:
<details><summary>==================== Grammar ====================</summary>

[Your output here]

</details>

Inside the <details> tags (right after </summary>), output ONLY a concise bullet-point list using this exact format for each mistake:
- **Original:** "[exact phrase from my message]"
**Correction:** "[natural, native-sounding version]"
**Why:** [1 short sentence explaining the grammar/lexical rule]

If there are no significant errors, simply output: Great job! No major errors found.

Do not add greetings, explanations, or filler text outside or inside the tags.]