Punctuating dialogue can be confusing. Writers are encouraged to quote exact words in fictional writing, personal writing, and other genres too.
Nonetheless, that does not mean that the rule for when to use a capital letter and other punctuation marks is clear.
This PowerPoint provides a number of examples relevant to the punctuation of dialogue. The simple explanations combined with the examples will get students on the right track to having characters conversing on paper to evoke emotional responses from their readers.
After all, stating someone’s exact words is a lot more meaningful than just casually telling what was said.