This article was written for English teachers, but provides a slideshow and list of free mobile apps for learning and practicing proper grammar usage. Mobile apps are a great way to take our grammar learning everywhere we go. Whenever you have extra time just take out your mobile device and play a grammar game, take a grammar quiz, or practice grammar with a peer. Slides 7 to 12 in the embedded presentation illustrate how the apps help you improve your grammar through machine learning, dictionaries, translations and other cool features.