In my opinion, one of the challenges of language learning is being consistent to practice it everyday. I've been learning English for a long time but if I have to speak in front of native speaker, I will keep silent. My speaking skill is still not good. Someone has said it is because I have not used to speak or think in English for daily conversation. I can re-study the grammar but what's the point if I'm not going to use it in daily life. Learning other language ain't easy and I greatly appreciate people who is sacrifying their time to learn a new language.