Grammar Lab
Get AI-generated grammar explanations tailored to your reading material in yomeru.ai.
The Grammar Lab is yomeru.ai's flagship learning tool. Give it any Japanese sentence and it returns a full analysis: a color-coded structure diagram, grammar point explanations, nuance notes, related patterns, and detailed vocabulary — all generated by our AI in real time.
Free for everyone
You do not need an account to try Grammar Lab. The public page is open to everyone — analyze any sentence right now.
The public Grammar Lab page lets anyone analyze Japanese sentences without an account
What You Get
Every Grammar Lab analysis includes:
Structure diagram — A visual breakdown of the sentence, color-coded by function. Particles, verbs, nouns, and other components each get their own color so you can see how the sentence fits together at a glance.
Context translation — A natural English translation with notes explaining why that translation was chosen, not just what the words mean literally.
Grammar points — Each grammatical pattern in the sentence is identified and explained, with notes on formality, common usage, and potential pitfalls.
Nuance and usage notes — Subtle meaning differences, tone, and when you would (or would not) use this structure in real conversation.
Related patterns — Similar grammar that is worth comparing, so you can build a web of connected knowledge.
Vocabulary enrichment — Detailed vocabulary for every word in the sentence: kanji details, compound words, stroke order, and example sentences pulled from dictionaries.
How to Use Grammar Lab
The public Grammar Lab page works without logging in — just paste any Japanese sentence and get a full breakdown.
Pick an example or type your own
The page has 30 pre-built examples organized by difficulty — Beginner (green), Intermediate (amber), and Advanced (pink). Click any example to see the full analysis, or type your own Japanese sentence into the input field.
Choose from 30 pre-built examples or type your own Japanese sentence
Watch the analysis build
Our AI works in real time. You will see a progress indicator as it searches references, analyzes the sentence structure, and generates the explanation. The full guide streams in as it is created.
Explore the results
Read through the structure diagram, grammar points, and vocabulary. If something sparks a question, use Deep Dive (below) to ask follow-ups.
A completed analysis includes a structure diagram, context translation, grammar points, and vocabulary
When you are reading content in yomeru.ai, Grammar Lab uses your story's context to make explanations more meaningful.
Click a text region
Tap any text overlay on the page to open the word-by-word popup.
Tap any text overlay to open the word-by-word popup with Grammar Lab access
Click "Grammar Lab"
In the popup, hit the Grammar Lab button. The AI begins analyzing the sentence.
Get context-aware explanations
Because the AI knows what you are reading, it references your story's character names, plot details, and surrounding dialogue. Instead of a generic grammar explanation, you get one that is tied to the scene you are looking at.
Deep Dive
After viewing any Grammar Lab analysis, you can keep going. The Deep Dive feature lets you ask follow-up questions about anything in the guide: "Explain this pattern in simpler terms", "Show me more examples of this conjugation", or "How does this compare to a similar grammar point?" The AI continues the conversation with the original sentence as context.
The 30 Pre-Built Examples
The public page includes 30 curated sentences that cover a wide range of grammar. They are color-coded by level so you can find something appropriate whether you are just starting out or working through advanced material:
- Beginner (green) — Core grammar: particles, basic verb forms, simple sentence structures.
- Intermediate (amber) — Compound sentences, conditional forms, honorific language.
- Advanced (pink) — Literary constructions, nuanced conjunctions, formal written Japanese.
Click any example to instantly see the full analysis without typing anything.