My parents who are not native English speakers would love something like this in their native language Hindi.
It would be nice to have been able to select a full sentence and see how people would say it. I understand that right now you are getting this read on a word by word basis.
The word "bickering" did not trigger any voice so I am assuming this is one rough edge to look into.
My dad just ordered a $150 (Indian rupee equivalent) book from a local company when things like this would make the learning so much simpler.
I am going to send this to my parents and see what they say.
Thank you for doing this project.