When writing silence and pauses in dialogue, you need to consider how long, how frequent, and how noticeable they are. Appropriate punctuation, formatting, and description should be used to convey them clearly and effectively. Ellipses (...) indicate a trailing off, a hesitation, or an interruption; dashes (--) signify a sudden break, a change of direction, or an emphasis; parentheticals or beats can show a silent action, reaction, or pause; capital letters, italics, or bold can denote a silent sound, whisper, or shout; and description or narration can explain the length, effect, or meaning of the silence or pause. For example: "I don't know what to say..."; "Wait, what are you...?"; "I can't believe you--"; "You have to listen to me--this is important."; "(shrugs)"; "(SILENCE)"; "(whispers)"; "(SHOUTS)"; "They stared at each other in silence for a long time."; "He paused for a moment, as if searching for the right words."; and "She felt a chill of fear as he fell silent."