| Masculine (Singular) | Usage |
| un |
before all consonants [except for z, impure s (s+consonant), x, ps, gn] and vowels |
| uno | before z, impure s (s+consonant), x, ps, gn |
| UN (masculine) | UNO (masculine) |
| • un cancello / a gate • un marziano / a martian • un nodo / a knot • un traguardo / a finishing line • un sasso / a stone • un arco / a bow • un elfo / an elf • un istrice / a porcupine • un otre / a leather bottle • un uragano / a hurricane |
• uno zoccolo / a clog (but also a hoof) • uno strappo muscolare / a pulled muscle • uno psicologo / a psychologist • uno gnomo / a gnome |
| Feminine (Singular) | Usage |
| una | before consonants |
| un' | before vowels |
| UNA (feminine) | UN' (feminine) |
| una casa / a house una freccia / an arrow una giraffa / a giraffe una marmotta / a woodchuck una storia / a story |
un'allodola / a lark un'elica / a screw propeller un'idea / an idea un'onda / a wave un'umiliazione / a humiliation |
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