perustua

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Finnish

Etymology

perustaa +‎ -ua

Pronunciation

  • IPA(key): /ˈperustuɑˣ/,
  • Rhymes: -uɑ
  • Hyphenation(key): pe‧rus‧tua

Verb

perustua (intransitive)

  1. to be based on (e.g. of a work of art)
    Elokuva perustuu tositapahtumiin.
    The movie is based on a true story.
  2. to be based on, be grounded in (e.g. of an opinion)
    Mihin mielipiteesi perustuu?
    What is your opinion based on?
  3. to be founded on, be based on, rest on (e.g. of some sort of system)
    Tämä yhteiskunta perustuu luottamukselle.
    This society rests on confidence.

Conjugation

Inflection of perustua (Kotus type 52/sanoa, no gradation)
indicative mood
present tense perfect
person positive negative person positive negative
1st sing. perustun en perustu 1st sing. olen perustunut en ole perustunut
2nd sing. perustut et perustu 2nd sing. olet perustunut et ole perustunut
3rd sing. perustuu ei perustu 3rd sing. on perustunut ei ole perustunut
1st plur. perustumme emme perustu 1st plur. olemme perustuneet emme ole perustuneet
2nd plur. perustutte ette perustu 2nd plur. olette perustuneet ette ole perustuneet
3rd plur. perustuvat eivät perustu 3rd plur. ovat perustuneet eivät ole perustuneet
passive perustutaan ei perustuta passive on perustuttu ei ole perustuttu
past tense pluperfect
person positive negative person positive negative
1st sing. perustuin en perustunut 1st sing. olin perustunut en ollut perustunut
2nd sing. perustuit et perustunut 2nd sing. olit perustunut et ollut perustunut
3rd sing. perustui ei perustunut 3rd sing. oli perustunut ei ollut perustunut
1st plur. perustuimme emme perustuneet 1st plur. olimme perustuneet emme olleet perustuneet
2nd plur. perustuitte ette perustuneet 2nd plur. olitte perustuneet ette olleet perustuneet
3rd plur. perustuivat eivät perustuneet 3rd plur. olivat perustuneet eivät olleet perustuneet
passive perustuttiin ei perustuttu passive oli perustuttu ei ollut perustuttu
conditional mood
present perfect
person positive negative person positive negative
1st sing. perustuisin en perustuisi 1st sing. olisin perustunut en olisi perustunut
2nd sing. perustuisit et perustuisi 2nd sing. olisit perustunut et olisi perustunut
3rd sing. perustuisi ei perustuisi 3rd sing. olisi perustunut ei olisi perustunut
1st plur. perustuisimme emme perustuisi 1st plur. olisimme perustuneet emme olisi perustuneet
2nd plur. perustuisitte ette perustuisi 2nd plur. olisitte perustuneet ette olisi perustuneet
3rd plur. perustuisivat eivät perustuisi 3rd plur. olisivat perustuneet eivät olisi perustuneet
passive perustuttaisiin ei perustuttaisi passive olisi perustuttu ei olisi perustuttu
imperative mood
present perfect
person positive negative person positive negative
1st sing. — — 1st sing. — —
2nd sing. perustu älä perustu 2nd sing. — —
3rd sing. perustukoon älköön perustuko 3rd sing. olkoon perustunut älköön olko perustunut
1st plur. perustukaamme älkäämme perustuko 1st plur. — —
2nd plur. perustukaa älkää perustuko 2nd plur. — —
3rd plur. perustukoot älkööt perustuko 3rd plur. olkoot perustuneet älkööt olko perustuneet
passive perustuttakoon älköön perustuttako passive olkoon perustuttu älköön olko perustuttu
potential mood
present perfect
person positive negative person positive negative
1st sing. perustunen en perustune 1st sing. lienen perustunut en liene perustunut
2nd sing. perustunet et perustune 2nd sing. lienet perustunut et liene perustunut
3rd sing. perustunee ei perustune 3rd sing. lienee perustunut ei liene perustunut
1st plur. perustunemme emme perustune 1st plur. lienemme perustuneet emme liene perustuneet
2nd plur. perustunette ette perustune 2nd plur. lienette perustuneet ette liene perustuneet
3rd plur. perustunevat eivät perustune 3rd plur. lienevät perustuneet eivät liene perustuneet
passive perustuttaneen ei perustuttane passive lienee perustuttu ei liene perustuttu
Nominal forms
infinitives participles
active passive active passive
1st perustua present perustuva perustuttava
long 1st1
Possessive forms
Person sing. plur.
1st perustuakseni perustuaksemme
2nd perustuaksesi perustuaksenne
3rd perustuakseen
perustuaksensa
past perustunut perustuttu
2nd inessive2 perustuessa perustuttaessa agent4 perustuma
Possessive forms
Person sing. plur.
1st perustuessani perustuessamme
2nd perustuessasi perustuessanne
3rd perustuessaan
perustuessansa
negative perustumaton
instructive perustuen —
1) Used only with a possessive suffix.

2) Usually with a possessive suffix (active only).
3) Some uses of the verbal noun are called the 'fourth infinitive' by certain sources (more details).

4) Usually with a possessive suffix. May not be used with all verbs, especially intransitive ones (more details). Distinct from nouns with the -ma suffix and third infinitive forms.
3rd inessive perustumassa —
elative perustumasta —
illative perustumaan —
adessive perustumalla —
abessive perustumatta —
instructive perustuman perustuttaman
4th3 verbal noun perustuminen
5th1
Possessive forms
Person sing. plur.
1st perustumaisillani perustumaisillamme
2nd perustumaisillasi perustumaisillanne
3rd perustumaisillaan
perustumaisillansa

Derived terms

Further reading

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