More metaphors

The Open University has a couple of pages that explain metaphors in quite simple language. have a look at:
http://tscp.open.ac.uk/t185/html/wk1-2/introducingmetaphor.htm
and try the exercises as well:
http://tscp.open.ac.uk/t185/html/wk1-2/howcentraltothinking.htm

Have a look at this too. I think you'll find it very useful:
http://knowgramming.com/metaphors/metaphor_chapters/examples.htm
Alex