>Exception make rule useless.
>
>Let's say German grammar, where the exception is the rule. Made to bore pupils to death.
>;)

You should have learned from the best. Take english grammar, which has ONE rule. It says "we don't need rules, we have lists".

Unless you consider each entry in a list as a rule, then it gets complicated... take http://ndragan.com/langsr/gnorools.html - pronunciation rules, for example. They are (almost) all there, as soon as I remember them, it's now only a small matter of knowing which one applies to the word you want to read (reed, red).