This is awesome, though there's a bug somewhere that causes any character input into the field to submit. Perhaps triggered by going back and forth to the main menu.

Also it would be useful if you could have a 'hint' mode for the tense so you can remember which one it is. I can never remember the names of the tenses!

EDIT: Seems to be triggered reliably if I get something wrong. Then any character entered into the box will cause it to submit. Quitting and going back resets it.