i need a speech why we should we respect our elders
Please know that no one here will write a speech for you. It's YOUR assignment. We will, however, point you in a couple of directions and, once you have written your speech and posted it, we will be happy to comment on your ideas.
Consider --
the 4th (or 5th) commandment: http://en.wikipedia.org/wiki/Ten_Commandments
http://www.google.com/search?q=respect+elders&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA