Grammar Exercise: Question Tags Error

1. Their names are Bill and Bob, aren't they?
    Correct
    Not Correct

2. You should be able to understand the lesson, wouldn't you?
    Correct
    Not Correct

3. We were at the Jubilee Hotel last year, didn't we?
    Correct
    Not Correct

4. You can pick up an information pack at the hotel, can't you?
    Correct
    Not Correct

5. Most people weren't sure where to go, were they?
    Correct
    Not Correct

6. You're not hungry already, don't you?
    Correct
    Not Correct

7. Brian knows how to drive those big trucks, doesn't he?
    Correct
    Not Correct

8. George is in the office, doesn't he?
    Correct
    Not Correct