Understanding Conjugation

How Japanese Verbs Work

A clear, visual guide to understanding Japanese verb conjugation patterns. Learn the logic behind the forms so you can conjugate any verb with confidence.

Why Conjugation Matters

In Japanese, verbs change their form to express time (past/present), politeness, negation, desire, ability, and more. Unlike English where we add helper words ("I will go", "I can go"), Japanese transforms the verb itself.

Example:
(taberu) = to eat
(tabenai) = don't eat
(tabemasu) = eat (polite)
(tabeta) = ate
(tabetai) = want to eat

The Three Verb Types

Every Japanese verb falls into one of three categories. Understanding which type you're working with is the first step.

"Five-step" verbs that conjugate by shifting through 5 vowel rows

Examples:

"One-step" verbs with a stem that never changes

Examples:

する Suru

Irregular verbs formed by adding する to nouns

Examples:

How to Identify Verb Types

Step 1: Does it end in する?

✓
YES → It's a Suru verb
Examples: する、勉強する、散歩する
→
NO → Continue to Step 2

Step 2: Does it end in -eru (える) or -iru (いる)?

✓
YES → Probably Ichidan
Examples: 食べる (taberu), 見る (miru), 起きる (okiru)
⚠️ Watch Out for Exceptions!
Some verbs look like ichidan but are actually godan:
- to run [GODAN]
- to return [GODAN]
- to know [GODAN]

Step 3: Everything else

✓
It's Godan
Ends in: く、ぐ、す、つ、ぬ、ぶ、む、る、う
Examples: 行く (iku), 話す (hanasu), 飲む (nomu), 買う (kau)

Foundation: The Hiragana Sound System

Japanese sounds are organized in rows and columns. Godan verbs work by shifting between these rows:

Row k- s- t- m- r- w-
あ (A)
い (I)
う (U)
え (E)
お (O)
💡 Key Insight:
Notice how each column keeps the same consonant sound (k-, s-, t-, etc.), but the vowel changes (a, i, u, e, o). When we conjugate godan verbs, we're moving up and down these columns to create different forms.

Godan Verbs: The Five-Row System

Godan verbs work by changing the final sound to a different row. Let's use (hanasu - to speak) as our example:

Watch the Transformation

NEGATIVE (あ)
hanasanai
ます-STEM (い)
hanashimasu
DICTIONARY (う)
hanasu
POTENTIAL (え)
hanaseru
VOLITIONAL (お)
hanasou

Step-by-Step Process

1. Start with the dictionary form: (hanasu)
2. Identify the final sound: す (su) - this is in the う-row
3. Find it in the chart: Look in the s-column, う-row = す
4. To make negative: Move to the あ-row in the same column: す → さ
5. Add the ending: はなさ + ない =

⚠️ Past Tense: Special Sound Changes

Past tense is the one exception to the row-shift pattern. Instead, godan verbs use special endings based on the final sound:

く → いた
ぐ → いだ
す → した
つ/る/う → った
む/ぶ/ぬ → んだ

Ichidan Verbs: The Simple Pattern

Ichidan verbs are called "one-step" because the stem never changes. You simply drop る and add endings.

The Formula
Stem + る → Stem + ending

Example: (taberu - to eat)

Form Process Result
Negative
Polite
Past
Want to
Potential
Volitional
💡 Why It's Easy:
With ichidan verbs, once you memorize the endings (ない, ます, た, たい, られる, よう), you can conjugate any ichidan verb. No row-shifting, no special rules, no exceptions!

Suru Verbs: The Irregular Pattern

Suru verbs are formed by adding to a noun. They're irregular, but once you learn how conjugates, you can apply it to all suru verbs.

Example: (benkyou suru - to study)

Form する becomes... Result
Negative
Polite
Past
Want to
Potential
Volitional
💡 Special Note:
Notice that the potential form uses instead of following the regular pattern. This is why suru verbs are considered "irregular" - they have their own special rules!

Putting It All Together

Now that you understand the patterns, here's your strategy for success:

1️⃣
Identify the Type
First, figure out if your verb is godan, ichidan, or suru
2️⃣
Apply the Pattern
Use the right conjugation method for that verb type
3️⃣
Practice, Practice!
Use The Conjugator to drill until it becomes automatic