The best Spanish equivalent to the phrase: their relatives can visit soon, is:
Sus parientes pueden visitar pronto.Explanation:
Firstly, you must know that "sus parientes" can be replaced by the personal pronoun "ellos" or "they" in English, so, the conjugation of the verb "poder" in Present form in Spanish is:
Yo puedo.Tú puedes.Usted puede.Él puede.Ella puede.Ello puede.Nosotros/Nosotras podemos.Ustedes pueden.Ellos/Ellas pueden.How the personal pronoun used in the sentence is "ellos," the right conjugation of the verb is "pueden," next, after a modal verb (how is the verb "poder") if is used a verb, this must be in its infinitive form, in Spanish these form ending in "ar; er; ir," in this case the verb is "visitar."
nosotros fuimos
Explanation:
we went