Examples:

• Do you speak English very well.
• Do you speak English or don't you speak English?
• Do you speak English, because I can get a translator.
• Do you speak English? - Not yet, that's my first lesson!
• Do you speak English or Swedish?
• Do you speak English, please?
• Do you speak English by any chance, sir?
• Do you speak English very well?
• Do you speak English? I forgot to try English.
• I got there, and the instructor said, "Do you speak English?"