Ahhh, these. First off, there is no estes. Only estos and estas, which have intuitive endings. Same with the singular esta.
The only goofy ones are este for singular masculine and esto for concepts or something of unknown gender.
Note that está, estás, esté, and estés also exist---but they are all forms of the verb estar.
It would be great to get feedback on these recordings. I thought I had said the phrase perfectly, but I was scored incorrect, and I have no idea why! It could be a technical issue (with my laptop) but it could have been my pronunciation. It is frustrating that I have no means of knowing.