Is it possible to speak different Chinese dialects without knowing their written form or writing system, such as Wu, Hokkien, and Min?

 Yes, it is possible to speak different Chinese dialects without necessarily knowing their written form or writing system. In fact, this is quite common among speakers of various Chinese dialects, especially those who primarily communicate verbally within their communities.

Many Chinese dialects, including Wu, Hokkien (Min Nan), and Min (Min Dong and Min Bei), have their own distinct spoken forms that may differ significantly from Mandarin Chinese, the standard form of Chinese used in writing and formal contexts. While there are characters associated with these dialects, they are not as widely used or standardized as Mandarin Chinese characters.

Historically, written Chinese has been based on Classical Chinese, which was primarily used for literary and formal purposes. Mandarin Chinese, particularly in its written form, has become the standard for communication across different Chinese-speaking regions due to its widespread adoption by the government and education systems. As a result, speakers of other Chinese dialects may learn Mandarin for reading and writing but primarily use their native dialect for everyday speech.

Therefore, it's entirely possible for individuals to be fluent in speaking various Chinese dialects without necessarily being proficient in their written forms or writing systems. This situation is similar to how many people around the world may speak a language fluently without being able to read or write it proficiently