dori - Japanese grammar practice

Choose the Japanese grammar points you want to master. Dori turns them into a personal practice deck, gives you fresh AI-generated questions, and keeps drilling what you miss.

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Turn fuzzy grammar into usable Japanese.

You may recognise grammar patterns when you see them, but still freeze when you need to produce a sentence yourself. Dori helps by turning the grammar points you are studying into a personal practice deck, then using spaced repetition to bring back what you miss.

You are not following someone else's course. You are training the grammar you actually need.

See it in action

What a dori question looks like.

Dori questions are built around real grammar distinctions learners mix up. Not random fill-in-the-blank. Not just pattern matching.

契約書けいやくしょを提出ていしゅつする前まえに、住所じゅうしょと名前なまえをもう一度いちど確認かくにんし＿＿。

“You must check your address and name once more before submitting the contract.”

なければならない is correct because the sentence describes a necessary action before submitting an important document. なくてもいい would mean you do not have to check, and てもいい would mean it is merely allowed, not required.

Your personal deck

Choose the grammar you want to master.

Browse grammar points by level, search for the patterns you are studying, and add them to your own deck. Dori uses that deck to decide what to drill and what to review.

Total: 104 Active: 88

～こと

Actions, facts, and abstract concepts

～こと (advice & recommendation)

～ことだ, ～ないことだ

～ことにしている

Make it a rule to; habitually do

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Structure

Verb[る] + ことにしている
Verb[ない] + ことにしている

Explanation

Expresses an ongoing personal rule, habit, or policy that the speaker has consciously adopted. Often translated as "make it a rule to" or "always try to".

Examples

毎日運動することにしている。 I make it a rule to exercise every day.

寝る前に本を読むことにしている。 I make it a habit to read before bed.

夜はコーヒーを飲まないことにしている。 I make it a rule not to drink coffee at night.

エレベーターではなく階段を使うことにしている。 I try to use the stairs instead of the elevator.

Quick comparison:

Pattern	Core Idea
～ことにする	I decide
～ことにしている	I keep that decision as a personal rule
～ことになる	It gets decided / turns out that way
～ことになっている	The rule or arrangement already exists

💬 Community (0)

～ことにする

Decide to do; make a decision

～ことになる

It has been decided that; it turns out that

What dori helps you do

Targeted practice that goes deeper.

Not another quiz app. dori is built specifically to help you understand the distinctions that matter at your level.

Choose your grammar

Practice the patterns you are studying now, not a fixed beginner course.

Drill the distinction

Questions are designed around the differences learners actually mix up.

Review what you miss

Spaced repetition brings difficult patterns back until they stick.

Get fresh examples

AI generates new sentences so you are not just memorising one example.

Spaced repetition

dori remembers what you miss.

After each question, rate how it felt. Difficult patterns return sooner. Patterns you know well wait longer. Your review queue adapts to your actual mistakes.

Due today: 12 Weak: 3 New: 5

彼女かのじょはなぜ急きゅうに黙だまってしまったのだろうか。

Core grammar

Verb[plain] + のだろうか
[い-Adj] + のだろうか
[な-Adj + な] + のだろうか

Nuance

More casual than のでしょうか; adds speculation tone

Conjugation

だろう is auxiliary; becomes だろうか in question form

How did that feel?

AI keeps the practice specific.

Every question is generated around the grammar point you choose, the mistakes learners commonly make, and the level you are practicing at. That lets Dori give you fresh, targeted examples without repeating the same textbook sentences.

A practice layer, not a replacement

Use dori with whatever you already study.

Whether you study with textbooks, tutors, Anki, Bunpro, WaniKani, YouTube lessons, or your own notes, Dori gives you a focused grammar practice layer on top.

Common tools and resources Japanese learners use. No affiliation implied.

How dori compares

Dori serves a different job.

Most language apps want to replace your whole study routine. dori just wants to make your grammar stronger.

Course-style apps

Fixed lesson path

Built for broad progression

Less control over specific grammar points

Less focused on grammar nuance drills

that's doridori: a grammar practice tool Build your own grammar deck
 Drill specific patterns you choose
 SRS brings difficult items back
 AI keeps questions fresh
 Fits your existing study routine

Turn weak grammar points into usable Japanese.

Choose your patterns, practice the nuance, and review what actually needs work.

Start practicing