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"Si es, es" is Spanish for "If it is, it is". If you just mean "si es", that means "if it is". If you mean "Sí es" (with an accent on "Sí"), it means "Yes, it is".
"Es" and "son" mean "is" and "are" in Spanish.
Es - Is
quis es means "who are you?"
Mañana es. = Tomorrow it is.
Es means "it" in English.
no = no and es means is
"es' is not a prefix in Spanish.
Extra Strength
"Qué es" means "what is". "Quién es" means "who is."
es para mi = " is for me"
'como es' means 'how is'