The initial phase was characterized by the loss of voiced and unvoiced fricative consonants, for example the sound (h) is a variante of /f/ and was found in dialects in Extremadura and Andalusia as the result of the short pause /-s/ or /x/.
Classic Latin was based on a system of nominal infletion and common names could have various different terminations indicating the grammatical function within the oration.
As far as the grammar, there were readjustments to personal pronouns which differentiated modern Spanish from Medieval Spanish, illiminating the ambiguous form “vos” or “vuestra merced” to “usted” that served for the second person in singular and plural.
Texts in Áurico Castellano:
“…e pidiéndonos mercet que les emendásemos los sus usos que fallasémos que eran sin derecho e que les diésemos fuero por que uisquiessen derechamient daquí adelant …”
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