Actually good grammar does help the mechanic and just about any other profession too. Not everything is learned by doing after all. The teachers had to know the material and of course the students who went on to be mechanics, doctors, and lawyers etc.had to be able to read and comprehend what they were learning from their textbooks. And so good grammar is important there too. And as I and others have said you can't break a rule of grammar and get away with it unless you know the rule in the first place any more than you can figure out the best short cut to get where you are driving unless you know the main route. If you know the main route is 30 miles and you want to save a few miles travel you look for alternate routes to shave a few miles travel off the trip. but you can't begin to do that unless you know the main route is 30 miles long. The same goes for grammar.
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