I'm pretty sure I've read "Ad question one..." in the sense of "Addressing question one..." before, but the only usage on the web I find is by someone with a Hispanic name and m-w.com doesn't seem to ...
While writing a rhetorical question I ran into a case where it seemed natural to start a sentence with "I.e": How do we handle the case when the list is empty? I.e., if the filter matched no ...
When a sentence starts with e.g., should the e be capitalized? Neverminding that it might be better to start with "For example," ... Thinking of SE posts and comments, should the starting e be ...