1. Don't write too much of it! Dialogue can slow the pace of the action and plot, and so needs to be used with care. If you can show the characters doing something to illustrate how they feel rather than just having them say it, the effect is far more powerful. But do use dialogue when it actually is the best way to learn something. Sandra Gerth has written a very useful book about this  point - Show, Don't Tell. 2. Be careful with 'he said', 'she said'. You can sometimes wri