Too many PEOPLE don't know how to make a grammatical sentence!
I was shocked when I went on the road for one company, installing our equipment in packaging plants. Highly placed managers, responsible for hundreds of jobs and probably millions of dollars, often have trouble with Junior High School English.
I understand not being able to learn to spell - I rely on spell-check a lot - but I thought that people learned grammar by listening to other people, radio and TV.
Oh, well. Maybe in this century we can only learn CORRECT grammar by reading.