<h2>Right answer:</h2><h3>habrán cambiado</h3><h3 />
We use the future perfect when talking about something that will have been completed at a certain point in the future. Moreover, we can also use this tense to point out probability. In addition, this tense is often used to refer to <em>what might have</em> or <em>could have happened. </em>The formula of this tense is:
<em>Simple future of haber + past participle</em>
In this way habrán is the conjugation of the verb haber for the third person plural in the future perfect and cambiado is the past participle of the verb cambiar. So:
<em>En el futuro, los teléfonos quizás </em><em>habrán cambiado</em><em> a ser más pequeños</em>
