10. The following Verbs form the Infinitive irregularly:—
| Beuc, roar, | Beucaich. |
| Bùir, bellow, | Bùirich. |
| Geum, low, | Geumnaich. |
| Glaodh, cry, | Glaodhaich. |
| Caisd, listen, | Caisdeachd. |
| Eisd, hearken, | Eisdeachd. |
| Marcaich, ride, | Marcachd. |
| Thig, come, | Teachd, tighinn. |
| Faigh, find, | Faghail, faotainn. |
| Eirich, rise, | Eirigh. |
| Iarr, request, | Iarraidh. |
| Taisg, lay up, | Tasgaidh. |
| Coidil, sleep, | Codal. |
| Fuaigh, sew, | Fuaghal. |
| Gluais, move, | Gluasad, gluasachd. |
| Tuit, fall, | Tuiteam. |
| Teirig, wear out, | Teireachduinn. |
| Teasairg, deliver, | Teasairgin. |
Compound Tenses.
The compound Tenses of the first order are made up of the several simple Tenses of the auxiliary verb Bi be, and the Infinitive preceded by the Preposition ag at. Between two Consonants, ag commonly loses the g, and is written a'; as,
ta iad a' deanamh they are doing. Between two Vowels, the a is dropped, and the g is retained; as, ta mi 'g iarruidh I am asking. When preceded by a Consonant, and followed by a Vowel, the Preposition is written entire, as, ta iad ag iarruidh they are asking. When preceded by a Vowel, and followed by a Consonant, it is often suppressed altogether; as, ta mi deanamh I am doing[[53]].
The compound Tenses of the second order are made up of the simple Tenses of Bi and the Infinitive preceded by the Preposition iar after[[54]].
PASSIVE VOICE.
Simple Tenses.
The Preterite Affirm. and Negat. is formed from the same Tense in the Active, by adding adh. The Preter. Subj. adds teadh.
The Future is formed from the Fut. Act. by changing the Terminations in the Affirm. and Subj. into ar, (more properly far, as of old) and adding the same syllable in the Negative.