O diretor deixou o trompete ecoar no salão vazio.

Questions & Answers about O diretor deixou o trompete ecoar no salão vazio.

Why is the infinitive ecoar used here after o trompete?
The verb deixar ('to let' or 'to allow') acts as a causative verb here. Just like in English, we use the structure: causative verb + object (o trompete) + infinitive verb (ecoar). You do not need any joining words like que or a between them.
Could the sentence be written as O diretor deixou ecoar o trompete?
Yes! With causative and perception verbs like deixar, mandar, ver, and ouvir, it is very common in European Portuguese to keep the two verbs together. Putting the infinitive right after the main verb is completely correct and sounds very natural.
Why do we use the Pretérito Perfeito (deixou) here instead of the Imperfeito (deixava)?
We use deixou because this describes a single, completed event in the past. If the sentence used deixava, it would change the meaning to imply the director used to let the trumpet echo as a recurring habit, or was in the process of letting it happen.
If there were multiple trumpets (os trompetes), would ecoar need to become plural?
If the object is plural, you actually have a choice! You can leave the second verb in the standard, uninflected infinitive (deixou os trompetes ecoar) or you can conjugate it into the personal infinitive to match the plural trumpets (deixou os trompetes ecoarem). Both are perfectly correct when the object is a noun.

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