Why is english important if we already know how to speak fluent english?

cause we need to learn American, British, Australian, and Canadian

We can use it for successful communication as needed.

Explanation:

Knowing and Using are not the same. If you know how to speak English, it is still important to use it when you need for successful communication.

honestly, is this even a but since you asked, he's probably at the store trying to get you food.