It is called direct object to function that assumes a syntactic constituent , other than the grammatical subject, which is mandatory by a transitive verb . Also know as direct complement , its function is related to the accusative case .
The direct object complements the verb . Its inclusion is essential to complete the meaning of the action; otherwise, proper understanding is impossible. The action of the verb, in fact, falls on the direct object .
Let's look at a case: “Juan Martín del Potro beat Rafael Nadal”. In this case, the direct object is "Rafael Nadal", because if it is only expressed "Juan Martín del Potro won" would not understand the information .
In our language , the direct object can always be replaced by "the", "the", "the" or "the". Taking the previous example, it could be said: “Juan Martín del Potro beat him”.
This resource is the most common method for direct object recognition. By replacing the syntactic constituent with any of these personal pronouns, the sentence It must make sense. Another strategy is to ask the question. "To who?" or "What?", which must be able to be answered by the direct object:
“Matías called Gonzalo” (Who did Matthias call? Direct object: "To Gonzalo") / "Matthias called him"
“I brought cookies for the snack” (What suit for the snack? Direct object: "biscuits") / “I brought them for snack”
When an active sentence is converted into a passive sentence, on the other hand, the direct object is transformed into the subject patient. In the sentence "The impact tore the car apart", the direct object is "the car". When going from the active voice to the passive voice, it would look like this: "The car was torn apart by the impact".