Portuguese Phrase
Posso reservar usando um app de terceiros?
Meaning
A polite request asking whether it is allowed to make a reservation through a third‑party application. The speaker is seeking permission rather than just stating ability.
When to use
Use this sentence when you are at a hotel, restaurant, or any service that offers reservations and you want to know if you can book through an external app such as Booking.com, Airbnb, or a local delivery platform.
✦Grammar Breakdown
Possoreservarusandoumappdeterceiros?
Posso (poder)
First‑person singular present of the modal verb poder, used to ask for permission or ability.
reservar (infinitive)
The base form of the verb ‘to reserve’; after a modal verb the infinitive is required.
usando (gerúndio)
Gerund of usar, indicating the means by which the reservation will be made.
app (substantivo emprestado)
A colloquial abbreviation of ‘aplicativo’; treated as masculine singular.
de terceiros (locução prepositiva)
‘de’ + plural noun ‘terceiros’ meaning ‘of third parties’; specifies that the app is not owned by the speaker.
🗨In Conversation
Posso reservar usando um app de terceiros?
Can I book using a third‑party app?
Claro, pode usar o aplicativo que preferir.
Sure, you can use whichever app you prefer.
✕Common Mistakes
Pode reservar usando um app de terceiros?
‘pode’ is third‑person singular; the speaker must use ‘posso’ for first‑person.
Posso reservar usar um app de terceiros?
After ‘usando’ you need the gerund; ‘usar’ would change the structure.
Posso reservar usando um app de terceiro?
‘terceiro’ must agree in number with ‘app’; the correct plural is ‘terceiros’.
↔Alternatives
É possível reservar através de um aplicativo de terceiros?
Is it possible to book through a third‑party app?
Posso fazer a reserva com um app de terceiros?
Can I make the reservation with a third‑party app?
Você aceita reservas feitas por apps de terceiros?
Do you accept reservations made via third‑party apps?
Cultural Tip
In Brazil, many businesses partner with popular platforms (iFood, Booking.com, etc.), but some still prefer direct contact. Using a polite form like ‘Posso…?’ shows respect and avoids sounding demanding. Also, note that ‘app’ is widely understood, but in more formal contexts you might say ‘aplicativo’.