How can u say you require a language or dialect?

Once you don't know how to write it but you can speak it... it doesn't mean you require the knowledge of that language.

In Asia, I know there are many ppl who claim to know certain dialect/language, but they don't know 2 write it... so it doesn't mean they require the knowledge of that language.

It means they can speak it but not write it.

Dialect is a kind language that can be understood by people from the same place, usually there are no written words or grammar, which means you can speak but not write it. Basically language means those can both be spoken and written. To help you learn Chinese mandarin faster and easier, please check http://www.hellomandarin.com .