Something I never understand in English

Since my first language isn't English either, I would recommend to "learn" by using everything you can. That helped me a lot.
I actually mean reading, watching movies (sub or not), listening to music (real listening) and of course writing in forums/internet! No one ever made fun of me because I mistyped a work or used a totally wrong word. Eg on here, people rather help you than blame you for something you simply can't know.
Those "tricks" worked really fine for me so far, that's why I felt I should tell you

American global geopolitical victory in the 90s caused a massive wave of American culture hitting the rest of the world, and us kids got to drink it all up like Kool-aid (check origin of this phrase if you don't know it yet, horrific!). For example here in former Yugoslavia, TV rolled a heckin' ton of American stuff - endless made-for-TV dramas, shows like Ricky Lake, Jerry Springer, Oprah, and for cartoons we had Cartoon Network and later on Nickelodeon, those things didn't even have subtitles! In schools though, we still learn Ye Good Olde Bri'ish English, so as a consequence, we're exposed to English variants from both sides of the pond. I myself am the biggest fan of more southern American accents, they flow so nicely, and they have some interesting phrases, like "y'all just hop on in!", which is a relevant artefact for this thread speaking of these word combinations .