The question:

¿Quién le dio a Isabel un vestido tan bonito? (Who gave Isabel such a beautiful dress?)

Next, we´ll have to use the future perfect tense, and complement directo/ indirecto to answer the question.

Sus padres se lo habrán regalado/ Her parents will have given it to her.

As you can see, the indirect object pronoun “se”, and the direct object pronoun “lo” are singular, masculine. They refer to the dress.

Sus padres se lo habrán regalado.

First, we´ll have to make an assumption about this statement:

Vi a José manejando el coche de Vera./ I saw José driving Vera’s car.

We´ll have to use the pronoun “Ella” (she) and the verb “vender” (to sell)

Next, we answer the question using the indirect object pronoun “se” (sing. 1st person)before the indirect object pronoun “lo” (sing., m.). which refers to Vera´s car.

Ella se lo habrá vendido. /She must have sold it to him.

Ella se lo habrá vendido.

First, we´ll have to make an assumption based on this question:

¿Cómo nos llegó esta tarjeta postal?/ How did this postcard get to us?

We´ll have to use the subject Nuestros primos (our cousins) and the verb enviar (to send)

Next, we´ll use the indirect object pronoun “Nos” (First-person, Plural) before the direct object pronoun “la” (singular, feminine) to answer the question.

Nuestros primos nos la habrán enviado./ Our cousins will have sent it to us.

Nuestros primos nos la habrán enviado.

First, we´ll have to make an assumption based on this statement.

Luis dice que ya entiende los problemas de matemáticas./ Luis says he already understands math problems.

We´ll have to use:

Subject: el profesor/ the professor
Verb: explicar/ to explain

Next, we´ll answer the question using the indirect object pronoun “se” (sing, 3rd person) before the direct object pronoun “los” (plural, 3rd person)

El profesor se los habrá explicado./ The teacher will have explained them to him.

El profesor se los habrá explicado.

First, we´ll make an assumption based on this statement:

Clara dice que sabe tus planes./ Clara says she knows your plans.

We´ll have to use:

Subject: alguien/ someone
Verb: decir/ to tell

Next, we´ll make the assumption replacing the indirect object pronoun with “se” before the direct object pronoun “lo” (plural, m.); which refers to her plans.

Alguien se los habrá dicho./ Someone must have told her.

Alguien se lo habrá dicho.

First, we´ll have to make an assumption based on this question:

¿Sabes que yo ya he visto las fotos de Teresa?/ Do you know that I have already seen Teresa’s photos?

We´ll have to use:

Subject: su novio/ her boyfriend
Verb: mostrar/ to show

Next, we´ll have make the assumption using the indirect object pronoun “te” (2nd person, singular) before the direct object pronoun “las” (feminine, plural), which refers to Teresa´s photos.

Su novio te las habrá mostrado./ Her boyfriend will have showed them to you.

Su novio te las habrá mostrado.

We´ll have to make an assumption based on this statement

Ellos van al mismo hotel que Alberto./ They go to the same hotel as Alberto.

We´ll have to use:

Subject: él (He)
Verb: recomendar (to recommend)

Next, we replace the indirect object with “se” next to the direct object pronoun “lo” (sing., masculine). Then, we use the prepositional phrase a ellos (to them) to clarify.

Él se lo habrá recomendado a ellos / He will have recommended it to them.

Él se lo habrá recomendado a ellos.

First, we´ll have answer this question:

¿Cómo es que no tienes aquellos discos digitales? / How come you don’t have those digital records?

We´ll have to use:

Subject: mis amigos/ my friends
Verb: llevarse/ to take

Next, we replace the indirect object pronoun with “se” before the direct object pronoun “los” (masculine, plural); which refers to the CDs

Mis amigos se los habrán llevado./ My friends will have taken them.

Mis amigos se los habrán llevado.