How can I see what questions my student got wrong?
I'd like to be able to better help them by seeing exactly what sentences / phrases they got incorrect. I don't see this under the Activity Log.
However, you as a teacher will not have access to this information unless you have your students send you a screenshot.
I think one of the beauties of Duolingo -- especially in this time of remote learning -- is that your student won't be able to progress until he gets everything right. So for the moment, just fall back on the patterns that you already know to look for, and work on those with your students. Just my advice.