や否や (やいなや) is a formal, literary expression meaning "as soon as" or "the moment that." It indicates that the second action occurs immediately after the first, with virtually no time gap between them. The emphasis is on the instantaneous or nearly simultaneous nature of the two events.
Structure
The verb preceding や否や is always in the dictionary form (plain non-past), regardless of the overall tense of the sentence:
、。
The moment the bell rang, the students rushed out of the classroom.
Even though the overall sentence is in the past tense, the verb before や否や () remains in the dictionary form.
Usage notes
- や否や is primarily used in written language, such as novels, news reports, and formal essays. It is rarely used in everyday conversation.
- The subject of the first and second clauses can be the same or different.
- The second clause is almost always in the past tense, describing something that already happened.
- Because of its literary tone, it often describes dramatic, sudden, or unexpected actions.
、。
The moment I opened the door, the cat dashed outside.
、。
No sooner had he sat down than he fell asleep.
Several other grammar points express similar meanings but differ in nuance and formality:
- ～たとたん（に）: Also means "the moment," but is slightly less formal and emphasizes an unexpected result.
- ～なり: Very similar to や否や in formality. With ～なり, the subjects of both clauses are typically the same person.
- ～か～ないかのうちに: Emphasizes the ambiguity of whether the first action was even completed before the second began.
- ～そばから: Describes repeated occurrences where something keeps happening right after another action.
や否や is among the most formal and dramatic of these expressions.
Lingaku