Hola, ¿Cómo estás? Mira, se trata del presente simple que se contruya de la manera siguiete: I explain - Yo explico you explain - Tú explicas He,she,it explainS - Él , ella, usted explica We explain - Nosotros explicamos You explain - Vosotros explicaís They explain - Ellos,ellas,ustedes explican Preguntas se contruyen así: Do + I, you, we, they + explain DOES + he, she, it + explain Sentencias negativas el pronombre personal: I, you, he,she,it,we,you,they + Do/DOES + NOT + Explain Espero que eso te ayude. Cualquier cosa, puedes contar conmigo. Si necesites clases, puedes reservarlos acá: http://www.italki.com/teachers/professional ¡Que tengas un día genial!

Mariana, it would be extremely rare for you to conjugate a sentence with 'somebody' as the subject and 'explains' as the verb. If you did find such a sentence, it would more likely be in the past tense as in, "somebody explained to him how to understand women". Of course, that is fiction but it is still a good example. :) I think the phrase you are asking about is actually in the command form as in, "somebody, please explain to me how to use this software!" In this case, "explain" has no "s" on the end. This would be a very common phrase using "somebody" and "explain". I hope this helps.

It's 3rd person singular, so you'd say "Somebidy explain". By the way, "¿" doesn't exist in English, so you shouldn't write it.