Something to say.

Written language is a funny old game, full of contradictions and rules based on structure called grammar. The invention of the rules is often unearthed in what could be termed antiquated languages such as Latin, language that is rarely used other than by certain professions (medical and law) to confuse the layman and ensure that the sanctity of the profession is enhanced along with the bill when their services are required.
To most of us we learn by making the sounds, usually vowels, and linking visual pictures to simple words (bat, cat). Over time we develop a vocabulary and increase our understanding as we learn the words that express our feelings and describe our surroundings. Its a non stop event as we read more and try to understand writers who each have a story to tell. Our childhood which once needed a story teller is still with us as we open a book and begin to read.
Some children find difficulty with reading. It was often thought that a child who was a slow reader was backward and often the child was made to feel miserable by the sarcasm of the teacher and the jibes of the peer group.
The difficulty the child experiences is now recognised as their being dyslectic. The brain somehow reverses letters on a page and makes gobbly gook of the sentence, destroying its meaning. Only with effort can the process be unscrambled. Its a life long experience but over time as the vocabulary grows and the sentence structure becomes more recognisable the process of reading changes, from acknowledging each word,  to anticipating the drift of what is being written and establishing an understanding, relying on subliminal  memory to fill the gaps in the written sentence.
Spelling is a great stumbling block. Spelling knows no failure, each letter has its exact place and it is this requirement that defeats the dyslectic. There is no way they can find order or organisation when most letters and numbers are reversed when presented in the brain.
When driving and one is given a directive, "turn left" the dyslectic has to rationalise the whole process. On the instruction, turn left one instinctively feels that the turn is to the right and there has to be a whole internal rationalisation within ones head to force the hands to turn wheel towards the left.    Counting backwards in a game of darts is a nightmare, finding words to fit a crossword equally so. There is no spacial background to build upon, only individual numbers or letters.
So when the Professor of linguistics demands correctness in every nuance I have to point out that perhaps the overall meaning is a greater achievement,   if of course, one has something to say.