Ayer yo prometí llevar a mi sobrino al cine.
This sentence means - Yesterday, I promised to take my cousin to the cinema.
When it comes to the word ayer (= yesterday), you know immediately that you should use the preterite form of a verb, which in this case is prometer. For first person singular, I, that form is prometí.
Answer:
A direct object indicates the object on which the action is performed.
Explanation:
Some examples:
I wrote my homework.
I bought a new notebook.
Pour me some water.
I don't feel remorse.
