Hey there. Since I'm not a native speaker of English, I'm looking for a detailed grammar app for iPhone 5 to improve my knowledge, which I will find even the smallest details about English language. I looked over the appstore, but couldn't find anything other than a large number of apps that were made for people to test themselves by. If you want to help me, I'm waiting for your responses. Additionally, I would rather not download a simple app which will not teach me anything different from what I have already known. Thanks in advance.