Comparative Grammar of Spanish, Portuguese, Italian and French

Hello, my friends.
Spanish: Hola, mis amigos.
Portuguese: Olá, meus amigos.
Italian: Ciao, i miei amici.
French: Salut, mes amis.
Nowadays thousands of grammar books, textbooks, outlines,
references and language guides of Spanish, Portuguese, Italian and
French are published year by year. However, all of them teach these
languages separately. Here you will find a comparative grammar of the
four major Romance languages together based on their grammatical and
lexical similarities for you, lovers of foreign languages, to learn and
compare Spanish, Portuguese, Italian and French simultaneously. It is an
audacious endeavor to find or create a novel way of learning to speak
several languages and becoming a multilingual person.
Below I will discuss six reasons why I decided to write this book
and why you need it. Also, I will try to answer such questions as whether
it is possible and not confusing to learn several languages
simultaneously, and why you should ever learn Spanish, Portuguese,
Italian and French.