Appendix:Old Irish conjugation of is

Form		1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
Ind.	Present	am	at, it	is	ammi, ammin(n), immi	adib, idib, adi	it
	Pres.rel.	nondaL	nondaL	asL/N	nondan, nnundan, nundem	nondad	ataL/N, at
	Pres.interrog.	inda	—	in imbí (habitual)	—	—	indat
	Pres.neg.	nítaL, nídaL	nít(a)L, nídaL	ní nipi, nibi, níbí (habitual)	nítanL, nídanL, nitam	nítad, nídad	níta(a)t, nídat, nít, nis
	Pres.​neg.​rel.			(direct) nádL (indirect) nan(d), na(n)t, ná(i)ch			(direct) natat (indirect) nandat
	Pres.​neg.​interr.	—	cenita	cani, cini	—	—	—
	Past	basa	basat	ba	—	—	batir
	Past rel.			ba			batar
	Past neg.	nipsa	—	nípu, níbu, níbo, nípo, níp	—	—
	Past neg. rel.	—	—	napo, nadmbu	—	—	—
	Past neg.interr.	cainipsa	—	—	—	—
	Perfect	rupsa, ropsa, robsa	robsat	rupu, rubu, ropu, rob(b)u, ropo	robum(m)ar	—	robtar, roptar
	Perfect rel.	romsa, rumsa	romsa, rumsa	rombu, rombo	—	—	romtar, rumtar
	Perfect neg.	nirbsa	—	nírbu, nírbo	nírbommar	—	nírubtar
	Perfect neg. rel.	—	—	nárbu	—	—	—
Sbj.	Present	ba	ba	ba, bá	—	bede	bat
	Pres.rel.	—	—	bes, bas	numman	—	bete, beta, beda, bata
	Pres.interrog.	—	—	im(b), imbo, indip, indib	—	—	innabet
	Pres.neg.	niba	—	níbo, níp	—	—	—
	Pres.​neg.​rel.			náp, nab	—	nábad, nambaid	napat
	Past	bin, benn	—	bid, bith, fid (misspelled lenited form)	bemmis, bimmis	—	betis, bitis
	Past rel.			bed, bad			—
	Past neg.	—	—	nibed, níbad	ní bimmis	—	—
	Past neg. rel.	námmin	—	nábad	—	—	—
Imperative			ba	bad, pad, bed	ban, baán	bad, bed	bat
Future		be	ba	bid, bith	bemmi, bimmi, bami	—	bit
Future relative		—	—	besL, basL	—	—	betaL
Future negative		—	—	nípa, níba, níbbá	—	—	nipat, níbat
Conditional		—	—	bedL (relative)	—	—	—
Verbal noun		buith

Combined forms

Preceding term	Present indicative
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
ara (“for/before whom/which”)	—	—	arndid	—	—	—
cía (“although; whatever etc.”)	—	—	cesuL, cíasuL, cesoL, cíasoL, cíasaL, cid	cíammin	cenutad, cenotad, cenuded	cetuL, cetoL, cíatoL
cía + ní (“although ... not; whatever ... not etc.”)	—	—	cenid, cinid, cinith	—	—	—
coN (“so that”)	conda	conda	con(d)id combi (habitual)	condanL	condad	condat
coN + nách (“so that ... not”)	—	—	connách	—	—	—
dïa (“from/of whom/which; to/for whom/which”)	—	—	dïandid, dïan(t)	—	—	dïan(d)at
dïa + nád (“from/of whom/which ... not; to/for whom/which ... not”)	—	—	—	—	—	donnatdet
frissa (“against whom/which”)	—	—	frisin, frisnid	—	—	frisndat
i (“in whom/which”)	—	—	indid, innid	—	—	indat
lasa (“with whom/which”)	—	—	lasin lasmbi (habitual)	—	—	—
má (“if”)	—	madda	mas(s)uL, másuL, masoL, masaL	—	—	matuL
má + ní (“if ... not”)	—	—	manid	—	—	—
oa (“from which”)	—	—	hónid, óndid	—	—	—
sech (“and yet”)			sechi (“whoever/whatever it is”)			sechitat (“whoever/whatever they are”)

Preceding term	Past indicative
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
aN (“when”)	—	—	—	—	—	(an)amtar
cía (“although”)	—	—	cepu	—	—	cebtar, ciaptar
dia (“from/of whom/which; to/for whom/which”)	—	—	diambu	—	—	—

Preceding term	Perfect indicative
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
aN (“when”)	anarbsa, annarobsa	—	—	—	—	—
cía (“although”)	—	—	—	—	—	ceruptar
coN	corupsa	—	cor(ro)bu, conrubu	—	—	conruptar
i (“in whom/which”)	—	—	—	—	—	híroptar
lasa (“with whom/which”)	—	—	lasinrubu	—	—	—

Preceding term	Present subjunctive
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
ara (“for/before whom/which; in order that”)	—	armba	a(i)rimp, arim, a(i)rndip, airndib	—	—	armbat
ara + ní/nád (“for/before whom/which…not; in order that…not, lest”)	—	—	arnap	—	—	—
bés (“perhaps”)	—	—	bésu, béso	—	—	—
bés (“perhaps”)	—	—	bésu, béso	—	—	—
cía (“whatever etc.”)	ciaba	ciaba, ciafa	cíab, cib, cip	—	—	—
cía (“although”)	—	—	c(e)ith, cid, ceth cithisse (“it is even he”)	—	—	cit
cía + ní (“although ... not; whatever ... not etc.”)	—	—	cenib, cenip, cinip	—	—	cinbat
coN (“so that”)	—	comba	condip, condib	comman	combad	combat
coN + ro- (“so that”)	—	—	corrup, cor(r)op, corub	—	—	—
día (“if”)	díam	—	díam, dem	—	díambad	—
má (“if”)	—	—	ma(i)d	—	ma[nba]d	mat
má + ní (“if ... not”)	mainba	—	ma(i)nip	—	—	mainbet
ro-	—	—	rop(o), rob(o), robu, rodbo	—	—	ropatL
sech (“and yet”)			sechib, sechip (“whoever/whatever it may be”)			—

Preceding term	Past subjunctive
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
aN (“when”)	—	—	—	—	—	amtis
ara (“for/before whom/which; in order that”)	armbenn	—	ar(i)mbad	—	—	airmdis, airmtis
cía (“although”)	—	—	cid	—	—	—
coN (“so that”)	combin, commin	—	combed, combad, combath	commim(m)is	—	comtis
coN + ní/nád (“so that ... not”)	—	—	conapad	—	—	coniptis conabdis
coN + ro- (“so that”)	—	—	corpad	—	—	—
día (“if”)	—	—	diambad	—	—	—
má (“if”)	—	—	mad	—	—	matis
má + ní (“if ... not”)	—	—	mainbed, mainbad, manib(b)ad, manipad	—	—	maniptis
ro-	—	—	robad	—	—	—

Preceding term	Future
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
aN (“when”)	—	—	—	—	—	ambat, anambet
i (“in whom/which”)	—	—	imba	—	—	—

Preceding term	Conditional
	1st sg.	2nd sg.	3rd sg.	1st pl.	2nd pl.	3rd pl.
ro-	—	—	rop(p)adL, ro(m)badL	—	—	robtis, roptis

^L = triggers lenition

^N = triggers nasalization