Дайте краткие и полные ответы на следующие вопросыcan you speak english? can you take english books from the library? must you help your friends? must you work at your english regularly? may i come in?

Can you speak English? Yes, I can. I can speak English a little bit.
Can you take English books from the library? Yes, I can.  I can  take English books from the library.
Must you help your friends? Yes, I must. I must  help my friends.
Must you work at your English regularly? Yes, I must. I must you work at my English regularly
May I come in? Yes, you may, You may come in.