The Chaos (by G. Nolst Trenité, a.k.a.
"Charivarius"; 1870 - 1946)

"Dearest creature in creation
Studying English pronunciation,

I will teach you in my verse
Sounds like corpse, corps, horse and worse

I will keep you, Susy, busy,
Make your head with heat grow dizzy.

[snip]..........

But be careful how you speak,
Say break, steak, but bleak and streak.

Previous, precious, fuchsia, via,
Pipe, snipe, recipe and choir,

Cloven, oven, how and low,
Script, receipt, shoe, poem, toe.

[snip].........."

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Go to :
http://www.tu-graz.ac.at/T0x811be681_

0x00008f8c;sk=E40B09CB 
for the whole poem.