Some verbs do not follow a regular set of rules. These are called the irregular verbs. There are 11 such verbs and must each must be learned across the tenses.
Within the above branches, the verbs are broken down even further into
Briathra Caol (Slender Verbs). Slender verbs last vowel is i and e. - Bris, Bailigh
Briathra Leathan (Broad Verbs). Broad verbs last vowel is a , o and u. - Dún, Ceannaigh
Each of these have different endings!
'F' Verbs - Using the rules above, you can conjugate verbs beginning with 'F' i.e. Put D'fh at the beginning. This rule only applies in the past tense.
Vowel Verbs - Using the rules above, you can conjugate verbs beginning with a vowel i.e Put D' before it. This rule only applies in the past tense.