| Sing. | Plur. | |
|---|---|---|
| Nom. | pata | padat |
| Part. | pataa | patoja |
| Gen. | padan | patojen, [pataen] patain |
| In. | padassa | padoissa |
| El. | padasta | padoista |
| Il. | pataan | patoihin |
| Ad. | padalla | padoilla |
| Abl. | padalta | padoilta |
| All. | padalle | padoille |
| Abes. | padatta | padoitta |
| Prol. | [padatse] | padoitse |
| Transl. | padaksi | padoiksi |
| Ess. | patana | patoina |
| Com. | [patane] | patoine |
| Instr. | [padan] | padoin |
Such words as sota, war, korva, the ear, do not change the final a to o in the plural.
| Sing. | Plur. | |
|---|---|---|
| Nom. | sota | sodat ([30]) |
| Part. | sotaa | sotia |
| Gen. | sodan | sotain or sotien |
| In. | sodassa | sodissa |
| Il. | sotaan | sotiin |
| etc. | etc. |
Polysyllabic nouns are declined as follows:—
| Sing. | Plur. | |
|---|---|---|
| Nom. | korkea | korkeat |
| Part. | korkeata korkeaa | korkeita korkeoita |
| Gen. | korkean | korkeiden (-eoiden) korkeitten (-eoitten) |
| In. | korkeassa | korkeissa |
| Il. | korkeaan | korkeihin |
| etc. | etc. |
| Sing. | Plur. | |
|---|---|---|
| Nom. | harakka | harakat ([25]) |
| Part. | harakkata harakkaa | harakoita harakkoja |
| Gen. | harakan | harakoiden harakoitten, harakkojen |
| In. | harakassa | harakoissa |
| Ill. | harakkaan | harakkoihin |
| etc. | etc. |
Similarly, Isäntä, a father of a family, makes isäntää, isännän (t becoming n by rule [31]), isännässä. This word in the plur. loses its final vowel, and does not change it to o. Isännät, isäntiä, isäntien (-äin), isännissä, etc.
Comparatives whose root ends in -mpa, -mpä, change the final vowel to i in the nominative sing.; e.g. parempa, better. Nominative parempi, partitive parempaa or parempata, genitive paremman (by rule [34]), inessive paremmassa, etc. Plur. nominative paremmat, partitive parempia, genitive parempien, parempaen, or parempain, inessive paremmissa, illative parempiin, etc. All comparatives reject the final a before the i of the plural.
C. All roots ending in -i. The root of the plural ends in the diphthong ei or short i, e.g. kaupunki, a town.