A sentence may contain a direct object, or a direct and an indirect object.
A sentence with a direct object is made up of subject + verb + direct object. To find the direct object, ask who or what after the verb.
Example: Nobuntu sings a song.
The subject is “Nobuntu” and the verb is “sings”. Sings who or what? – sings a song – the direct object is “a song”.
To find the indirect object, ask to whom or what, or for whom or what after the direct object.
Example: Nobuntu sings a song for the audience. Sings a song (the direct object) to whom or for whom? – the audience – so “the audience” is the indirect object.