Extending the app
One can see two little icons at the bottom: a + sign at the center and another one on the left. These are the tools with which the user can extend the app. The center icon can be used to add new sentences to the app, and the left one to download sentences that some teacher has previously put online. The new sentences that one can add to the app are grouped into a new section called "Custom sentences" by default. One can also make a long press on the + sign and create a new section. As many sections as needed and as many sentences as desired can be added to the full version of the app, the only limit being the amount permitted by the memory available on the device.
