Learning language since smallest age I have a younger brother. He is four years old. The brother knows Russian well, but sometimes he makes mistakes. His mistakes look like the mistakes which people does on italki. Even if you learned a language during several years and listen it every day, you would make mistakes. At the same time if you didn't use some words in your conversation, you would foget it. You will to change this word to another but it will be not nice. All languages are so difficult...