Directing the Action
When running a theatre rehearsal, a stage director has to watch, listen, allow, and command.
In Portuguese, when you use perception verbs like ver (to see) or ouvir (to hear) with an infinitive, the object pronoun (me, te, o, a, os, as) attaches to the conjugated verb, not the infinitive. In an affirmative sentence, it is connected with a hyphen.
Letting and Making
The exact same rule applies to causative verbs like deixar (to let) and fazer (to make). You attach the pronoun to the conjugated verb, and the second action simply stays in the infinitive.
Triggers that Move the Pronoun
As with standard pronoun rules in Portuguese, certain "magnetic" words will pull the pronoun to the front of the conjugated verb, dropping the hyphen altogether.
When using this infinitive structure, look out for negative words like não (not), relative pronouns like quem (who), and time conjunctions like mal (as soon as). These will force the pronoun to sit directly before the main verb.