The tragic downfall of Macbeth was not determined by one single cause. It was rather caused by a combination of three dark forces: supernatural, external, and internal. Supernatural forces are represented by the three witches and dark powers behind them. Lady Macbeth is an outer force that pushes Macbeth towards the bloody deeds. Macbeth's own ambition acts as deciding power in brining him to his downfall. The very beginning of the play indicates that dark supernatural forces will be involved. Three weird sisters are preparing a surprise for ....