Jr. Analytical grammar question

It is very helpful to learn mechanics; however, it is hard to find a program that does not teach them by displaying incorrectly capitalized and punctuated sentences. Most programs give wrong examples for the student to correct. Charlotte Mason was very concerned with making sure the students saw the correct versions of word spellings as much as possible, and I’m thinking that principle applies to puncutation and capitalization as well. So I’m hesitant to recommend a course that incorporates incorrect examples for the student to see. I would much rather find a program (or write one) that encourages the student to study correct examples, be able to give the reasons for each mechanic aspect in it, and practice using them correctly.