Glossika. Also, the best grammar reference for English speakers is "A New Reference Grammar of Modern Spanish" by John Butt et al. Spanish is extremely patter

Glossika. Also, the best grammar reference for English speakers is "A New Reference Grammar of Modern Spanish" by John Butt et al. Spanish is extremely pattern-regular and maps to English very well once you "see the Matrix" and learn the tricks. Happy to help — if you like, let me know your contact info and I can get in touch back-channel.