What was the process of the Spanish verb's evolution from Latin?
Morphologically speaking.
2 Answers
There are entire books dedicated to that, and detailed phonetics has to be taken into consideration to explain morphological changes. How are we supposed to summarize such a complex topic in a single post?
Latin was a very logical, precise language. Then someone invented text messaging and it all wen't to Hell because of laziness and ignorance. That's why Latin is now a dead language. Spanish had to be invented to restore literacy on the Iberian peninsula.