I understand that the exercise was meant to be solved or identified by the reader, rather than being posted as a separate entity. As far as examples are concerned, you have certainly included excellent ones in your article. My suggestion was to change the style of these examples. You could, for example, explain how to correctly use auxiliary verbs by saying something like:

"When asking a question, be sure to use the auxiliary verb 'do' to form a proper question. For example, instead of saying 'You like pizza?', say 'Do you like pizza?"

Including practical examples such as this will give your readers a better understanding of how to correctly use verbs in their own writing.

I hope my recommendation on changing the style of examples in your article was helpful to you. If you prefer to maintain your original style of writing examples, please feel free to do so. I'm simply here to offer suggestions and make a positive contribution to your work. No offense is intended.