@ColinTheMathmo I lived in Mexico City from birth until I was 18, then again from the ages of 23-30. I went for 12 years to a posh English-language school where all classes were in English except some requirements like Mexican history and Spanish literature. So I am native in both Spanish and English.
I haved lived in Montreal for close to a decade, so I picked up French informally from the streets. I also studied a bit of Russian because I dated a couple of Russians, in both my cities.
@ColinTheMathmo Broadly speaking, there is no problem of understanding between European and American varieties of #Spanish, but there are numerous differences in #vocabulary, #syntax, and #phonetics. The most prominent differences of syntax are that European Spanish uses some different personal pronouns and some verb tenses differently. In phonetics, the most obvious difference is that no American Spanishes make a distinction when pronouncing s and z while almost all European Spanishes do.