Sometimes you can find patterns in English grammar, but other times English doesn’t make sense at all. For example, why are “read” (reed) and “read” (red) the same word, but pronounced differently depending on whether you’re speaking in the past or present tense? Or why is “mice” the plural of “mouse”, but “houses” is the plural of “house”?
Unfortunately, there are just as many exceptions as there are rules in English. It’s easy to get stuck on learning how to speak English properly, if you try to find a reason for everything. Sometimes English is weird and unexplainable, so instead the best thing to do is just memorize the strange exceptions and move on.
Studying British for an hour once a week isn’t usually enough to make any real progress. The best way to quickly improve your Fluent British is to spend at least a few minutes practicing every day. Immerse yourself as much as possible every time you study, and challenge yourself to listen to, read, and even say things in English that you think might be too difficult for you. If you want to speak English fluently, you need to make it an essential part of your everyday life.