Can anyoe help me with perspective drawing?

http://drawsketch.about.com/library/weekly/aa021603c.htm

in own words...
1. start basic horozontal line made ruler, mark off 1 point @ end of left, , 1 on right (vanishing points #1 , #2). measure line , put dot in middle well.
2. next draw verticle line goes through middle point. (this give height of building , angle...)
3. have 4 points in diamond ish shape. sooo... connect dots =d
4. youve got funky diamond line in middle, can start adding doors/windows whatever... must in perspective!!!

example, add door on left half of building, start drawing line ruler starting @ left vanishing point until hits middle verticle line. shows height of top of door. add 2 verticle lines parallel middle line, whereever want, , adds sides of door. erase rest of pencil , have door in perspective :)

there many cool tricks can add perspective drawings... did 1 grade 11 visual arts exam, city block in 2 point perspective. lots of fun! use ruler always! ... never guess line cause wont work out!

hope works !!

i don't perspective drawing. in few days have painting based on perspective , worth 30 percent of whole art mark. there website explains perspective drawing? if can give me site?

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