From Wiktionary, the free dictionary
Thematic present from Proto-Indo-European *gʷʰer- ( “ warm, hot ” ) .
*gʷereti [ 1]
to heat up
Thematic present, t-preterite
Active voice
Present
Imperfect
Future
Preterite
1st singular
*gʷerū
*gʷeremam
?
*gʷeram
2nd singular
*gʷeresi
*gʷeretās
?
*gʷers
3rd singular
*gʷereti
*gʷereto
?
*gʷert
1st plural
*gʷeromosi
*gʷeremo
?
*gʷerme
2nd plural
*gʷeretesi
*gʷerestē
?
*gʷerte
3rd plural
*gʷeronti
*gʷerento
?
*gʷerant
Pres. subjunctive
Past subjunctive
Imperative
1st singular
*gʷerasū
?
—
2nd singular
*gʷerasesi
?
*gʷere
3rd singular
*gʷeraseti
?
*gʷeretou
1st plural
*gʷerasomosi
?
*gʷeromos
2nd plural
*gʷerasetesi
?
*gʷerete
3rd plural
*gʷerasonti
?
*gʷerontou
Passive voice
Present
Imperfect
Future
Preterite
1st singular
*gʷerūr
—
?
?
2nd singular
*gʷeretar
—
?
?
3rd singular
*gʷeretor
?
?
?
1st plural
*gʷerommor
—
?
?
2nd plural
*gʷeredwe
—
?
?
3rd plural
*gʷerontor
?
?
*gʷeranto
Pres. subjunctive
Past subjunctive
Imperative
1st singular
*gʷerasūr
—
—
2nd singular
*gʷerasetar
—
—
3rd singular
*gʷerasetor
—
—
1st plural
*gʷerasommor
—
—
2nd plural
*gʷerasedwe
—
—
3rd plural
*gʷerasontor
—
—
Declension of the present participle
masculine
singular
dual
plural
nominative
*gʷeronts
*gʷeronte
*gʷerontes
vocative
*gʷeronts
*gʷeronte
*gʷerontes
accusative
*gʷerontam
*gʷeronte
*gʷerontans
genitive
*gʷerantos
*?
*gʷerantom
dative
*gʷerantei
*gʷerantbom
*gʷerantbos
instrumental
*gʷerantī?
*gʷerantbim
*gʷerantbis
feminine
singular
dual
plural
nominative
*gʷerantī
*gʷerantī
*gʷerantiyās
vocative
*gʷerantī
*gʷerantī
*gʷerantiyās
accusative
*gʷerantīm
*gʷerantī
*gʷerantiyans
genitive
*gʷerantyās
*?
*gʷerantyom
dative
*gʷerantyāi
*gʷerantyābom
*gʷerantyābos
instrumental
*?
*gʷerantyābim
*gʷerantyābis
neuter
singular
dual
plural
nominative
*gʷeront
*?
*gʷeronta
vocative
*gʷeront
*?
*gʷeronta
accusative
*gʷeront
*?
*gʷeronta
genitive
*gʷerantos
*?
*gʷerantom
dative
*gʷerantei
*?
*gʷerantbos
instrumental
*gʷerantī?
*?
*gʷerantbis
Declension of the middle participle
masculine
singular
dual
plural
nominative
*gʷeromnos
*gʷeromnou
*gʷeromnoi
vocative
*gʷeromne
*gʷeromnou
*gʷeromnoi
accusative
*gʷeromnom
*gʷeromnou
*gʷeromnons
genitive
*gʷeromnī
*gʷeromnous
*gʷeromnom
dative
*gʷeromnūi
*gʷeromnobom
*gʷeromnobos
instrumental
*gʷeromnū
*gʷeromnobim
*gʷeromnobis
feminine
singular
dual
plural
nominative
*gʷeromnā
*gʷeromnai
*gʷeromnās
vocative
*gʷeromnā
*gʷeromnai
*gʷeromnās
accusative
*gʷeromnam
*gʷeromnai
*gʷeromnans
genitive
*gʷeromnās
*gʷeromnous
*gʷeromnom
dative
*gʷeromnai
*gʷeromnābom
*gʷeromnābos
instrumental
*?
*gʷeromnābim
*gʷeromnābis
neuter
singular
dual
plural
nominative
*gʷeromnom
*gʷeromnou
*gʷeromnā
vocative
*gʷeromnom
*gʷeromnou
*gʷeromnā
accusative
*gʷeromnom
*gʷeromnou
*gʷeromnā
genitive
*gʷeromnī
*gʷeromnous
*gʷeromnom
dative
*gʷeromnūi
*gʷeromnobom
*gʷeromnobos
instrumental
*gʷeromnū
*gʷeromnobim
*gʷeromnobis
Declension of the past participle
masculine
singular
dual
plural
nominative
*gʷritos
*gʷritou
*gʷritoi
vocative
*gʷrite
*gʷritou
*gʷritoi
accusative
*gʷritom
*gʷritou
*gʷritons
genitive
*gʷritī
*gʷritous
*gʷritom
dative
*gʷritūi
*gʷritobom
*gʷritobos
instrumental
*gʷritū
*gʷritobim
*gʷritobis
feminine
singular
dual
plural
nominative
*gʷritā
*gʷritai
*gʷritās
vocative
*gʷritā
*gʷritai
*gʷritās
accusative
*gʷritam
*gʷritai
*gʷritans
genitive
*gʷritās
*gʷritous
*gʷritom
dative
*gʷritai
*gʷritābom
*gʷritābos
instrumental
*?
*gʷritābim
*gʷritābis
neuter
singular
dual
plural
nominative
*gʷritom
*gʷritou
*gʷritā
vocative
*gʷritom
*gʷritou
*gʷritā
accusative
*gʷritom
*gʷritou
*gʷritā
genitive
*gʷritī
*gʷritous
*gʷritom
dative
*gʷritūi
*gʷritobom
*gʷritobos
instrumental
*gʷritū
*gʷritobim
*gʷritobis
Middle Irish: gerthiut ( 3sg. with suffixed pronoun )
^ Schumacher, Stefan, Schulze-Thulin, Britta (2004 ) Die keltischen Primärverben: ein vergleichendes, etymologisches und morphologisches Lexikon [The Celtic Primary Verbs: A comparative, etymological and morphological lexicon ] (Innsbrucker Beiträge zur Sprachwissenschaft; 110 ) (in German), Innsbruck: Institut für Sprachen und Literaturen der Universität Innsbruck, →ISBN , pages 372-373