How to form negative and past sentences in Japanese
To form negative and past sentences in Japanese, here is a concise guide:
Negative Sentences in Japanese
- Verbs are negated by changing their endings depending on their group:
- Godan verbs (う-verbs): change the verb ending according to a pattern and add ない (nai). For example, 書く (kaku, “to write”) becomes 書かない (kakanai, “do not write”).
- Ichidan verbs (る-verbs): drop the る (ru) and add ない (nai). For example, 食べる (taberu, “to eat”) becomes 食べない (tabenai, “do not eat”).
- For the copula です (desu), replace it with ではありません (de wa arimasen) for a formal negative or じゃないです (janai desu) more casually. For example, これは本です (kore wa hon desu, “This is a book”) becomes これは本ではありません (kore wa hon de wa arimasen, “This is not a book”). 2
How Godan Verbs Change in Negative Form
Godan verbs undergo a consonant shift before adding ない. This is because their stem ends with a syllable from the u-row, which changes to the corresponding a-row syllable as part of negation:
| Dictionary Form | Negative Stem | Negative Form |
|---|---|---|
| 書く (kaku) | 書か | 書かない |
| 話す (hanasu) | 話さ | 話さない |
| 飲む (nomu) | 飲ま | 飲まない |
This pattern is consistent across all godan verbs, which makes memorization easier once the syllable changes are understood.
Past Negative Sentences in Japanese
- The past negative form is created by taking the negative form of the verb (which ends with ない), removing the い (i), and replacing it with かった (katta).
- For example:
- 飲まない (nomanai, “do not drink”) becomes 飲まなかった (nomanakatta, “did not drink”).
- 食べない (tabenai, “do not eat”) becomes 食べなかった (tabenakatta, “did not eat”).
- This pattern works consistently for all verbs, including irregular ones.
- For です, the past negative form is ではありませんでした (de wa arimasen deshita) or じゃなかったです (janakatta desu) in casual speech. 1 3 4
Irregular Verb Negations: する and 来る
- The verb する (to do) negates as しない (shinai) in the present negative.
- Its past negative is しなかった (shinakatta).
- The verb 来る (くる, to come) negates as こない (konai) in present negative.
- Its past negative is こなかった (konakatta).
These irregular verbs are common and essential, so mastering their negative and past negative forms is crucial.
Common Mistakes and Pitfalls
- Confusing Godan and Ichidan verbs: Sometimes beginners misidentify verb groups and apply the wrong negation pattern. For example, mistakenly treating 書く as an Ichidan verb and trying to remove る, which it doesn’t have.
- Forgetting to change the final syllable in Godan verbs: Simply adding ない without converting the verb stem from u-row to a-row results in incorrect forms (e.g., 書く + ない = 書くない, which is wrong).
- Mistaking じゃないです and じゃありません: Both are casual negatives of です, but じゃありません is more formal. Using the casual form in very formal situations can sound unnatural.
- Past negative form formation: Some learners might forget to remove い from ない before adding かった, leading to forms like 書かなかった instead of the correct 書かなかった; the nuance can be subtle, but the grammatical form is fixed.
Step-by-Step Guide to Forming Negative and Past Negative Sentences
Step 1: Identify the verb group (Godan, Ichidan, or Irregular).
Step 2: For negative present:
- Godan: Replace final u-sound with corresponding a-sound + ない; e.g., 書く → 書か + ない = 書かない
- Ichidan: Drop る + ない; e.g., 食べる → 食べ + ない = 食べない
- Irregulars: する → しない, 来る → こない
Step 3: For past negative:
- Take the negative present form ending in ない
- Remove い (the last kana of ない)
- Add かった
- e.g., 書かない → 書かな + かった = 書かなかった
Step 4: For です:
- Negative present formal: ではありません
- Negative present casual: じゃないです
- Past negative formal: ではありませんでした
- Past negative casual: じゃなかったです
Comparing Formal and Casual Negative Forms
| Context | Negative Present | Negative Past |
|---|---|---|
| Formal | ではありません (de wa arimasen) | ではありませんでした (de wa arimasen deshita) |
| Casual | じゃないです (janai desu) | じゃなかったです (janakatta desu) |
Understanding when to use formal vs. casual forms is important. Formal negatives are appropriate in written Japanese, business settings, or with people of higher status. Casual negatives appear in everyday conversations among friends or family.
Using Negative and Past Sentences in Context
Negative Sentences:
-
今日は雨が降らない。
(Kyō wa ame ga furanai.)
”It is not raining today.” -
映画を見ない。
(Eiga o minai.)
”I do not watch movies.”
Past Negative Sentences:
-
昨日、昼ご飯を食べなかった。
(Kinō, hirugohan o tabenakatta.)
”I did not eat lunch yesterday.” -
その本を読まなかった。
(Sono hon o yomanakatta.)
”I did not read that book.”
Including time expressions like 昨日 (kinō, yesterday) or 今日 (kyō, today) helps clarify the past negative usage in real conversations.
FAQ: Clarifying Common Doubts
Q1: Can I use じゃない instead of じゃないです?
Yes. じゃない is even more casual and often used in spoken informal Japanese. However, じゃないです sounds slightly more polite and is recommended in polite casual contexts.
Q2: How do negative forms work with adjectives?
For い-adjectives, the negative present ends with くない, and the past negative ends with くなかった. For example, 高い (takai, “expensive”) → 高くない (takakunai, “not expensive”) → 高くなかった (takakunakatta, “was not expensive”). This differs from verbs but is important for expressing negation with descriptive words.
Q3: Is 書かなかった more natural than 書かない でした for past negative?
Yes. 書かなかった is the grammatically correct past negative. Forms like 書かないでした are ungrammatical because ない is an adjective, not a verb, so it cannot take でした.
Summary Table of Verb Forms
| Form | Godan Verb Example (書く/kaku) | Ichidan Verb Example (食べる/taberu) | Copula Example |
|---|---|---|---|
| Present Affirmative | 書く (kaku) | 食べる (taberu) | です (desu) |
| Present Negative | 書かない (kakanai) | 食べない (tabenai) | ではありません/じゃないです |
| Past Affirmative | 書いた (kaita) | 食べた (tabeta) | でした (deshita) |
| Past Negative | 書かなかった (kakanakatta) | 食べなかった (tabenakatta) | ではありませんでした/じゃなかったです |