Causative Verbs: Fazer, Mandar, and Deixar
When you want to express that someone makes, tells, or allows someone else to do something, you use a causative verb followed by an infinitive. The most common causative verbs are fazer (to make), mandar (to order or tell), and deixar (to let or allow).
The sentence structure usually follows this pattern:
[Causative Verb] + [Person or Thing acting] + [Infinitive]
If the person or group receiving the instruction is obvious from the context, you can omit them entirely and place the infinitive directly after the causative verb.
Perception Verbs: Ver and Ouvir
Verbs of perception, such as ver (to see) and ouvir (to hear), use this exact same grammatical structure when you observe an action taking place. While English often uses an "-ing" word (like "hearing the soloist singing"), Portuguese generally prefers the infinitive.
Replacing the Object with a Pronoun
Because the person, instrument, or group performing the action is grammatically the direct object of the first verb, you can replace it with a direct object pronoun (such as o, a, os, or as).