The ordinals for first and third have shorter forms in a particular position.
The idea
Before a masculine singular noun, use primer and tercer: el primer día, el tercer piso. Feminine nouns use primera and tercera. When used without a following noun, use the full form: el primero, el tercero.
Examples
- Hoy es mi primer día.Today is my first day.
- Vivo en el tercer piso.I live on the third floor.
- Es la primera vez aquí.It is the first time here.
- La tercera clase empieza pronto.The third class starts soon.
- Mi primer libro está allí.My first book is over there.
- El tercero espera en la fila.The third person is waiting in line.
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Watch out
When the noun follows, standard formal usage prefers primera for a feminine noun; shortened primer is heard in some American varieties.
Try it yourself
Choose the form before día. Hoy es mi ___ día. (primer / primero)
Show answer or example answer
primer
Día is masculine singular, so primer comes before it.
Choose the form before piso. Vivo en el ___ piso. (tercer / tercero)
Show answer or example answer
tercer
Piso is masculine singular, so use tercer.
Choose the form before vez. Es la ___ vez aquí. (primera / primero)
Show answer or example answer
primera
Vez is feminine singular, so use primera.
Practice round
Answer questions, then rebuild Spanish sentences where available. We keep your score.
Choose the form before día. Hoy es mi ___ día. (primer / primero)
Choose the form before piso. Vivo en el ___ piso. (tercer / tercero)
Choose the form before vez. Es la ___ vez aquí. (primera / primero)
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Describe a first day, a third floor and a first visit using the appropriate forms.

