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Some Secret Codes

Age 7 to 11 Challenge Level:

Here is the alphabet:

a  b  c  d  e  f  g  h  i  j  k  l  m  n  o  p  q  r  s  t  u  v  w  x  y  z


I have made a code that means we move $3$ places to the left to discover what the code stands for. But what will happen to

a b c ?

They pick up the letters left over at the end of the alphabet so that they become

x  y z  

You can think of the letters as if they were arranged on a wheel like this:
A coding wheel
Print out and make
So can you work out what these codes stand for?

sdw - d - fdnh,

wkh - zhvw - zlqg - eorzv,

brx - duh - zrunlqj - kdug


Can you invent some messages of your own?

Can you create some different ways of coding?