Let us try this explanation: A person reads if he
derives the copy which he is producing from the model which he
is copying.
(I will use the word “model” to mean that which
he is reading off, e.g., the printed sentences
which he is reading or copying in writing, or such signs as
“--..-” in
42) and 43) which he is “reading” by his
movements, or the scores which a pianist plays off,
etc.
The word “copy” I use for the sentence spoken or
written from the printed one, for the movements made
73.
according to such signs as
“--..-”, for the
movements of the pianist's fingers or the tune which he plays
from the scores, etc.)
Thus if we had taught a person the Cyrillic alphabet and had taught him
how each letter was pronounced, if then we gave him a piece printed in
the Cyrillic script and he spelt it out according to the
pronunciation of each letter as we had taught it, we should undoubtedly
say that he was deriving the sound of every word from the written and
spoken alphabet taught him.
And this also would be a clear case of reading.
(We might use the expression, “We have taught him the
rule of the alphabet”.)