Okay, so you know how people speak different languages all around the world, right? Well, sometimes when you're learning a new language, the language you already know can kind of sneak into the new language you're trying to learn. This is called crosslinguistic influence!
It's like when you're playing with your toys and you start using the blocks from your toy castle to make a tower for your toy car. Your brain is using what you already know to try to figure out how to use the new toy in a similar way.
So, when you're learning a new language, your brain might accidentally put words or grammar from the language you know into the new language. This can make it a little tricky to really learn the new language because your brain is constantly trying to mix the two languages together.
But don't worry - this is totally normal! And the more you practice and learn the new language, the easier it will be for your brain to keep the two languages separate. Just like how you got better at building towers for your toy car with practice!