If teachers taught, why
didn't preachers praught?

Yup, English is difficult even for those who mock it. The foregoing
should really be "If teachers taught, why =haven't= preachers
praught?" (It's not really necessary to say "If teachers have
taught...", but the original is definately wrong)

Jose
--
Money: What you need when you run out of brains.
for Email, make the obvious change in the address.