From Proto-Celtic *marwāti. By surface analysis, marb + -aid.
marbaid (conjunct ·marba, verbal noun marbad)
| 1st sg. | 2nd sg. | 3rd sg. | 1st pl. | 2nd pl. | 3rd pl. | Passive sg. | Passive pl. | ||
|---|---|---|---|---|---|---|---|---|---|
| Present indicative | Abs. | marbu, marbaim | marbai | marbaid | marbmai | marbthae | marbait | marbthair | |
| Conj. | ·marbu, ·marbaim | ·marbai | ·marba | ·marbam | ·marbaid | ·marbat | ·marbthar | ||
| Rel. | |||||||||
| Imperfect indicative | |||||||||
| Preterite | Abs. | marbais | |||||||
| Conj. | ·marbus | ·marb | ·marbsat | ||||||
| Rel. | |||||||||
| Perfect | Deut. | ro·marb | ro·marbsat | ||||||
| Prot. | |||||||||
| Future | Abs. | mairfid | |||||||
| Conj. | ·mairbfe | ·mairfem | ·mairfider | ||||||
| Rel. | |||||||||
| Conditional | ·marfed | ·mairfitis | |||||||
| Present subjunctive | Abs. | marbitir | |||||||
| Conj. | ·marb | ·marba | |||||||
| Rel. | |||||||||
| Past subjunctive | ·marbaind | ·marbtais | |||||||
| Imperative | |||||||||
| Verbal noun | marbad | ||||||||
| Past participle | |||||||||
| Verbal of necessity | |||||||||
| Old Irish mutation | ||
|---|---|---|
| Radical | Lenition | Nasalization |
| marbaid also mmarbaid after a proclitic ending in a vowel |
marbaid pronounced with /β̃(ʲ)-/ |
unchanged |
| Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs. | ||