Because communication is important. I do not know if it is unable to communicate or talk about. But different people have different understanding of words to say about it.
Because communication is important. If I say I don't know it, it will not be able to communicate or talk about it, but everybody has a grasp on speaking only to speak understand.
Because communication is important if I don't know anything about it, it will not be able to communicate or speak, but I don't know if they understand the said he was going to say I don't know