Here's why:
* Classical Chinese is a written form of the Chinese language: It was primarily used for literature, philosophy, history, and official documents for centuries.
* Modern Chinese dialects have evolved from Classical Chinese: Over time, the spoken language diverged from the written Classical Chinese, and various dialects emerged.
* Mandarin is the standard spoken language of modern China: While Mandarin has roots in Classical Chinese, it's a distinct language with its own grammar, pronunciation, and vocabulary.
So, while Classical Chinese is still studied and understood by many, particularly scholars, it's not a language people speak in everyday life.