Indicative
sum is the only truly irregular form.
| Singular | Plural |
|---|---|
| sum | summus |
| es | estis |
| est | sunt |
The stem for the imperfect indicative is "er-". Then add the personal endings. Think of the way the imperfect is done in a regular conjugation (bam, bas, bat, etc.).
| Singular | Plural |
|---|---|
| eram | ermus |
| ers | ertis |
| erat | erant |
| Singular | Plural |
|---|---|
| er | ererimus |
| eris | eritis |
| erit | erunt |
| Singular | Plural |
|---|---|
| fu | fuimus |
| fuist | fuistis |
| fuit | furunt |
| Singular | Plural |
|---|---|
| fueram | fuermus |
| fuers | fuertis |
| fuerat | fuerant |
| Singular | Plural |
|---|---|
| fuer | fuerimus |
| fueris | fueritis |
| fuerit | fuerunt |
Subjunctive
The root of this form is "si-".Then add the personal endings.
| Singular | Plural |
|---|---|
| sim | smus |
| ss | stis |
| sit | sint |
| Singular | Plural |
|---|---|
| essem | essmus |
| esss | esstis |
| esset | essent |
| Singular | Plural |
|---|---|
| fuerim | fuermus |
| fuers | fuertis |
| fuerit | fuerint |
| Singular | Plural |
|---|---|
| fuissem | fuissmus |
| fuisss | fuisstis |
| fuisset | fuissent |