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Last Updated:2026/07/27
Sentence

If you do not take this medicine at fixed intervals, its effectiveness may decrease.

Related words

一定いってい

Hiragana
いってい
Adjectival noun

fixed, settled, certain

If you do not take this medicine at fixed intervals, its effectiveness may decrease.

Word Forms

The basic and commonly used forms of this adjectival noun.

Basic forms
Form Word form Usage
Imperfective form (mizenkei) Used in forms such as darou.
Continuative form (renyokei)
Alternative: 一定に 一定だっ
Used with de or ni.
Conclusive form (shushikei) Ends a sentence with da.
Attributive form (rentaikei) Modifies a noun with na.
Conditional form (kateikei) Expresses a condition with nara.
Imperative form (meireikei)
Alternative: 一定なれ
Used in formal expressions such as de are.
Common forms
Form Word form Usage
Te-form equivalent Connects clauses using de.
Ta-form Expresses the past with datta.
Nai-form
Alternative: 一定じゃない
Expresses negation with dewa nai or ja nai.
Desu-form Used for polite speech.

Japanese - Multilingual

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