The Bilingual Guide compares Spanish grammar (written in English) with that of English (written in Spanish) to help people learn the grammar rules of their second language in their native tongue. Bilingual writers may open two separate windows, one with a Spanish grammar topic and the other with its equivalent of English grammar, and compare the rules to distinguish the peculiarities of each language. Once readers of the Bilingual Guide understand these rules and concepts, they will be able to experiment with words in different languages.

Because the Real Academia Española (RAE) is recognized throughout the Spanish-speaking world, I will use some of the references it publishes to develop the Spanish grammar section of the Bilingual Guide. The Diccionario de la lengua española, RAE’s dictionary, and the Diccionario panhispánico de dudas, which provides explanations to doubts of Spanish usage, are free to use on RAE’s website. The other three references, Nueva Gramática de la lengua española, which offers descriptive interpretations of Spanish grammar, Ortografía de la lengua española, which describes the rules of Spanish orthography, and El Buen uso de español, which offers grammar and orthography rules written in simple language, are only available in print.