Okay, so let's say you want to learn a new language like French. There are a bunch of different things you need to learn, like how to say hello, how to make sentences, and how to use verbs. These things are all part of something called "grammar."
Now, imagine every different language has its own set of grammar rules that you need to learn. That would be a lot of work! But what if there was a way to learn one set of rules that could apply to all languages? That would make things a lot easier!
That's where applicative universal grammar comes in. It's like a set of tools that helps you learn any language. Instead of having to learn all the different rules for each language, you can use these tools to figure out how to put together sentences and use different parts of speech.
It's kind of like having a guidebook that shows you the basic building blocks of any language. You can use these building blocks to construct sentences and understand how the language works, no matter what language you're trying to learn.
So, applicative universal grammar is a set of rules and tools that make it easier to learn any language by breaking it down into basic building blocks that can be applied across different languages.