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?

1. Yes, I can speak English. As an AI, I am capable of communicating fluently in English, as well as in many other languages, to assist with various tasks.
2. No, I cannot take English books from the library. I do not have a physical form or a library card, so I cannot visit a Public Library to borrow physical items, though I can access a vast amount of digital information.
3. Yes, you must help your friends. According to social norms and Moral Philosophy, mutual support is a fundamental aspect of friendship and building strong community bonds.
4. Yes, you must work at your English regularly. Consistent practice is essential for language acquisition, as noted by Cambridge English, because regular exposure improves memory retention and fluency.
5. Yes, you may come in. This is a formal way to grant permission for someone to enter a room or join a conversation.

Please specify if you would like grammatical explanations for these modal verbs or additional practice exercises.