Nice tool
I teach English in Japan and this is one of the great tools that I use for both adult and kids classes. Its a fun way to practice simple grammar skills and the kids just love getting handed "Senseis iPhone" to "play" with. By having possible answers on the wheel, it allows the students to work through not only the correct sentences, but also to see some of the common mistakes that they make and realize why they are mistakes.
Gaijin Sama about
Sentence Builder