so it should followed by negative sentence

i think it will be true become like this "didnt you tell eve yet?" .. i didnt tell eve yet.. hope this help :)

"Yet" implies that you're talking about something that definitely will happen, if it hasn't happened already. In your example, "Did you tell Eve yet?" means "I know you have to tell Eve. Have you already told her, or are you going to tell her later?" If the other person responds and says, "No, I haven't told her yet," that means "I haven't told her, but I'm going to tell her later." The sentence "Did you tell Eve?" is simply asking if you told Eve. The speaker doesn't seem to be sure whether you told her, or even whether you will ever tell her. The other person could respond by saying, "Yes, I did," or "No, I don't want to tell her," or "No, I'm going to let someone else tell her," etc. The person could also respond by saying, "No, I haven't told her yet." This would be the same as saying, "I haven't told her, but I'm going to tell her."

You could use either one of those sentences and the listener would understand. The word "yet" simply calls attention to either the current moment, or an implied time in the future. For example: "I'm not ready yet!" - I am not ready, but I will be soon (calling attention to an implied time in the future) "I can't read the second book, I haven't read the first book yet." - I am planning to read the first book, but I haven't had a chance (calling attention to the present). A famous one is children on long car rides asking their parents "Are we there yet?" - Have we arrived at our destination? (Calling attention to the present) It can also be used to convey a sense of urgency. In your example "Have you told Eve yet?" makes it sound like either the listener HAS TO tell Eve at some point in the near future. Hope that helps!