1)Big Ben is a boy, isn't he?
No , he isn't.
2)Bus tickets are expensive, aren't they?
No , they aren't.
3)Charing Cross is near Trafalgar Square, isn't it?
Yes , it is .
4)Buses is London often have no doors, do they?
No , they do .
5)The Tower of London Is very old, isn't it?
Yes , it is .
6)Yon don't need a map in London, do you?
No , I do .