ymddwyn

Welsh

From ym- +‎ dwyn.

ymddwyn (first-person singular present ymddygaf)

Conjugation of *ymddwyn* (literary)
	singular			plural			impersonal
	first	second	third	first	second	third	impersonal
present indicative/future	ymddygaf	ymddygi	ymddwg	ymddygwn	ymddygwch	ymddygant	ymddygir
imperfect (indicative/subjunctive)/ conditional	ymddygwn	ymddygit	ymddygai	ymddygem	ymddygech	ymddygent	ymddygid
preterite	ymddygais	ymddygaist	ymddygodd	ymddygasom	ymddygasoch	ymddygasant	ymddygwyd
pluperfect	ymddygaswn	ymddygasit	ymddygasai	ymddygasem	ymddygasech	ymddygasent	ymddygasid, ymddygesid
present subjunctive	ymddygwyf	ymddygych	ymddygo	ymddygom	ymddygoch	ymddygont	ymddyger
imperative	—	ymddwg	ymddyged	ymddygwn	ymddygwch	ymddygent	ymddyger

verbal noun	ymddwyn
verbal adjectives	ymddygedig ymddygadwy

Conjugation of *ymddwyn* (colloquial)
inflected colloquial forms	singular			plural
inflected colloquial forms	first	second	third	first	second	third
future	ymddyga i, ymddygaf i	ymddygi di	ymddygith o/e/hi, ymddygiff e/hi	ymddygwn ni	ymddygwch chi	ymddygan nhw
conditional	ymddygwn i, ymddygswn i	ymddyget ti, ymddygset ti	ymddygai fo/fe/hi, ymddygsai fo/fe/hi	ymddygen ni, ymddygsen ni	ymddygech chi, ymddygsech chi	ymddygen nhw, ymddygsen nhw
preterite	ymddygais i, ymddyges i	ymddygaist ti, ymddygest ti	ymddygodd o/e/hi	ymddygon ni	ymddygoch chi	ymddygon nhw
imperative	—	ymddyga	—	—	ymddygwch	—

Mutated forms of *ymddwyn*
radical	soft	nasal	h-prothesis
ymddwyn	unchanged	unchanged	hymddwyn

Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “ymddwyn”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies