If you happen to find it hard to have sustained conversations, try keeping your voice up at the end of the sentence. There is a charming graciousness in doing so, for it seems to say that you do not think your remarks are the last words to be said on the subject. It prevents you from seeming opinionated. How men dislike an opinionated woman! No one really likes her! To keep your voice up sounds as though you are interested in other people's ideas. The subject is still open!