However, I very quickly learnt that I was learning a new language. You can't go to the supermarket (grocery store) and pick up a trolley (cart), and ask for aubergines, courgettes and nappies (eggplant, zucchini and diapers). People look at your blankly. And why wouldn't they? You are not speaking American.
So what about when people come to the UK, and have to navigate the subtleties and subtext of English? Here are some guidelines. This table has been doing the rounds on the internet. I can't claim to have written it, although I wish I had. The source has become untraceable, but bravo to the author.