See älä; älkööt is a regular third-person plural imperative/optative form.
- (dated) The third-person plural form of the negative verb (negation verb) in imperative, may they not.
- Juoskoot! (“May they run!”) → Älkööt juosko! (“May they not run!”)
- Älkööt is used with a connegative form of the main verb, ending with -ko/-kö, identical to the form used with third-person singular, first-person plural and second-person plural.
- This form is quite often confused with älköön, which is the third-person singular form.
- The third person plural of the negative imperative is nowadays a bit old-fashioned so it, primarily, pertains to ceremonious, very formal, archaic, poetic or religious contexts [compare "Thou shalt not" in English] – i.e., positive imperative of this person (Juoskoot!) is, as the speaker's subjective wish, more common than the negative (Älkööt juosko!).
- The negation verb has no infinitive form.
- Indicative, conditional and potential moods use the indicative forms (stem e-), for which the verb is conjugated only in person.
- In the imperative mood the negation verb has the stem äl-.
- An archaic optative mood exists and is used mainly in poetry.