1. We learn English by watching English-language videos. (就画线部分提问)
                    you learn English?
2. Have you ever read the novels by Mark Twain? (作否定回答)
    No, I        .
3. I have been learning English for six years. (就画线部分提问)
                         you        learning English?
4. I don't know how I can spell new words. (改为简单句)
    I don't know               new words.
5. Why don't you keep an English notebook? (改为同义句)
    Why        an English notebook?