"I am a perfect man."
Translation:Je suis un homme parfait.
The BAGS rule is an easy way to remember which adjectives go before nouns. B=Beauty, A=Age, G=Goodness, and S=Size. If you have an adjective that fits into one of those categories, it will likely go before the noun in the sentence (but not always, as you can see in this example). If you want more information, you can check out http://french.about.com/od/grammar/a/adjectives_4.htm
Hope that helps! :)