how do you write parallel structure sentences

Here are two really good sites on using parallel structure:

http://owl.english.purdue.edu/handouts/grammar/g_parallel.html

http://74.125.93.104/search?q=cache:Mo2ILHN8bDkJ:www.evergreen.edu/writingcenter/handouts/grammar/parallel.pdf+parallel+structure+sentences&cd=5&hl=en&ct=clnk&gl=us&ie=UTF-8