What are 2 major themes of Macbeth? Explain & provide example particularly particularly, not long, 10 points!?

a href="http://www.bbc.co.uk/schools/gcsebitesize/english_literature/dramamacbeth/4drama_macbeth_themerev1.shtml" rel="nofollow"http://www.bbc.co.uk/schools/gcsebitesiz…/a - what a fantastic website. It explains four key themes, ambition, the supernatural, reality/appearance and loyalty/guilt.