How to treat the behavior of asking others to do something without making it clear?

Many conflicts in interpersonal communication also arise in this way. Everyone will take it for granted that the other person should know what he thinks, but on the one hand, no one really knows who it is, and on the other hand, the media such as language and writing can't fully express people's psychology, and this error in expression and understanding will also lead to contradictions ... then this will happen. I want you to do something, but I think you can understand it, but the other person can't understand it, or won't do it after understanding it.