Is mi I am, used in the Pres. and Pret. Tenses, which are declined as follows:—
Affirmative Mood.
| Present. | Preterite. |
| Sing. | Sing. |
| 1 Is mi, I am, it is I. | Bu mhi, I was, it was I. |
| 2 Is tu. | Bu tu. |
| 3 Is e. | B' e. |
| Plur. | Plur. |
| 1 Is sinn. | Bu sinn. |
| 2 Is sibh. | Bu sibh. |
| 3 Is iad. | B' iad. |
Negative Mood.
| Sing. | Sing. | ||
| ni, cha, nach, &c. |
| 1 mi, I am not, &c. | Bu mhi, I was not, &c. |
| 2 tu. | Bu tu. | ||
| 3 e. | B' e. | ||
| Plur. | Plur. | ||
| 1 sinn. | Bu sinn. | ||
| 2 sibh. | Bu sibh. | ||
| 3 iad. | B' iad. | ||
Subjunctive Mood.
| Sing. | Sing. |
| 1 Ma 's mi, If I be, it be I. | Nam bu mhi, If I were, it were I. |
| 2 's tu. | Bu tu. |
| 3 's e. | B' e. |
| Plur. | Plur. |
| 1 's sinn. | Bu sinn. |
| 2 's sibh. | Bu sibh. |
| 3 's iad. | B' iad. |
The only varieties of form which this Verb admits of, are the two syllables is and bu. Each of these syllables
commonly loses the vowel when it comes in apposition with another vowel.