I would give this zero stars if I could
You select an image you want to work with (say...Airplanes) then a page comes up with 4 sentences. You select the ones that are correct, and then that's it. I don't know why they are or are not correct. There are no explanations, no other pages, no directions, no sounds.
Once you have selected the image-square and are taken to the first "page" of the exercise, you've completed the whole of it.
This means you get 20 "pages" in total for this app. 21 if you count the front page with the pictures on it.
Don't waste your time or money. Total rip off!!!!!