Master the Japanese Dictionary Form (辞書形): The Gateway to N4 Grammar

Welcome to your comprehensive guide to the Dictionary Form (辞書形 - jishokei).辞書形

At the N5 level, you likely relied on the polite 〜ます (-masu) form. However, transitioning to N4 requires mastering the Dictionary Form. It is not only the casual, plain present-positive form used with close friends, but it also serves as the essential building block for advanced grammar patterns.

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1. How to Conjugate: From 〜ます to Dictionary Form

To conjugate verbs accurately, you must first identify which of the three verb groups your verb belongs to.

Group 1: U-Verbs (Godan)

For Group 1 verbs, change the ~i sound vowel immediately preceding 〜ます to its corresponding ~u sound.

Group 2: Ru-Verbs (Ichidan)

These verbs usually have an ~e or ~i sound before 〜ます. Conjugation is simple: drop 〜ます and add 〜る (-ru).

Group 3: Irregular Verbs

There are only two verbs in this group. You must memorize them:

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2. Essential N4 Grammar Patterns

Once you master the dictionary form, you can immediately unlock crucial N4 grammar structures. Here are two of the most common:

Pattern A: Expressing Ability (〜ことができる)

• Structure: [Verb in Dictionary Form] + ことができる (to be able to do [verb])

Example 1:

• 日本語を話すことができます。日本語話
• Nihongo o hanasu koto ga dekimasu.
• I can speak Japanese. (Literally: "The thing of speaking Japanese is possible.")

Pattern B: Sequencing Actions (〜前に)

• Structure: [Verb in Dictionary Form] + 前に (before doing [verb])前
• Note: The verb before 前に is always in the dictionary form, even if the main sentence is in the past tense.前

Example 2:

• ご飯を食べる前に、手を洗います。飯食前手洗
• Gohan o taberu mae ni, te o araimasu.
• Before eating a meal, I wash my hands.

Example 3:

• 日本へ行く前に、切符を買いました。日本行前切符
• Nihon e iku mae ni, kippu o kaimashita.
• Before I went to Japan, I bought a ticket.

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Quick Practice Challenge

Transform the following polite sentences into their plain (casual) dictionary form:

1. 毎日日本語を勉強します。
   $\rightarrow$ 毎日日本語を勉強する。 (I study Japanese every day.)毎日本語勉強
2. 音楽を聞きます。
   $\rightarrow$ 音楽を聞く。 (I listen to music.)音楽聞
3. 明日、友達が来ます。
   $\rightarrow$ 明日、友達が来る。 (My friend is coming tomorrow.)明日友達来

Keep practicing this transition until it becomes second nature, and you will have conquered one of the most vital milestones of the JLPT N4 level!