1.what difficulties do you have in learning,все предложения!!!

1. I just don't understand what should I do in exercises.2. I spend for English homework from half an hour to hour.3. At lesson I can remember just a few words, because I'm tired and sleepy.4. As for me, I think that the best way to learn foreign language is having regular conversations with native speakers.5. I use translator on my mobile phone to learn more new words.