How to Say "one more" in Spanish
The Spanish word for “one more” is “otra” — A1 level. This is a very common word in everyday Spanish.

Examples
No me gusta esta camisa. ¿Me muestras otra?
I don't like this shirt. Can you show me another one?
Necesito otra oportunidad para terminar el examen.
I need one more chance to finish the exam.
Una de mis hermanas vive en México y la otra vive en España.
One of my sisters lives in Mexico and the other lives in Spain.
Masculine vs. Feminine: `otro` vs. `otra`
otra is used for things that are grammatically feminine, like 'la casa' (the house). For masculine things, like 'el libro' (the book), you use its partner word otro.
Singular vs. Plural: `otra` vs. `otras`
If you're talking about more than one feminine thing, just add an 's': 'otras casas' (other houses), 'otras personas' (other people).
Don't use 'un' or 'una' with `otro`/`otra`
Mistake: “Quiero ~~una otra~~ galleta.”
Correction: Quiero **otra** galleta. In Spanish, `otro` and `otra` already include the idea of 'an' or 'a', so you don't need to add 'un' or 'una' before it.
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