Hi, Tomasz! How's it going? I have a student that uses the green bird app to learn some words and in my classes he would show me all the mistakes and difficulties he might have felt! It's quite interesting and usefull this way we do! Although I speak english to communicate with my students, I'm only teach portuguese, so If you feel like learning portuguese one day, I'm at your disposal! I'm brazilian and I would love to help people to learn the language through some conversation lessons! They will be some relaxed and fun lessons and still you'll be learning a lot, receiving corrections when welcome, off course, and getting in touch with some basic grammar, pronunciation, spelling and vocabulary!In addition to Brazilian culture, of course! Feel free to visit my profile! It will be a pleasure to meet you and provide us with a pleasant cultural exchange! <3 Um abraço! See ya!