http://www.mit.edu/~tahnan/finnish.html
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Nouns and Their Cases
Remember, self-confidence is the key to success. Never hesitate. When you are about to use a noun, always reflect according to the following pattern:
* which is the corresponding noun in Finnish?
* singular or plural?
* what case? Nominative, accusative, genitive, essive, partitive, translative, inessive, elative, illative, adessive, ablative, allative, abessive, comitative or instructive?
* is it possible to avoid using the noun?
After you have contemplated this during the proverbial fraction of a second, take a deep breath and pronounce the first half of the noun in a huge, booming voice. Then gradually weaken the voice so that by the time you pronounce the case ending, it is only in a hoarse whisper. This method of demonstrating your mastery of case usage is completely safe since, although you cannot prove that you were right, nobody, Finn or otherwise, can ever prove that you were wrong. Above all, look confident.