Here are some mixed examples:
• But you don't really love her, do you?
• This will work, won't it?
• Well, I couldn't help it, could I?
• But you'll tell me if she calls, won't you?
• We'd never have known, would we?
• The weather's bad, isn't it?
• You won't be late, will you?
• Nobody knows, do they?
Notice that we often use tag questions to ask for information or help, starting with a negative statement. This is quite a friendly/polite way of making a request. For example, instead of saying "Where is the police station?" (not very polite), or "Do you know where the police station is?" (slightly more polite), we could say: "You wouldn't know where the police station is, would you?" Here are some more examples:
• You don't know of any good jobs, do you?
• You couldn't help me with my homework, could you?
• You haven't got $10 to lend me, have you?
