1 Tickets must be bought by all visitors.
All visitors must buy tickets.
2 Sue gave Tony a book as a present.
Tony was given a book as a present by Sue.
3 She's too old to start to learn the piano.
She isn't young enough to start to learn the piano.
4 Everyone in my family loves science-fiction films.
In my family, all of us love science-fiction films.
5 We'll probably visit the gallery while we're in London.
We'll probably visit the gallery during our stay in London.
6 Museum trips can teach you a lot.
You can learn a lot on a museum trip.