Read the LEARN THIS! box. Make the active sentences passive. Use by where necessary.
1 William Shakespeare wrote Macbeth.
Macbeth was written by William Shakespeare.
2 They are performing a ballet at the concert hall this evening.
3 Does Lady Gaga design the costumes?
4 How many Hobbit films have they made?
5 The artist ought to sign the painting.
6 Thousands of people will visit the gallery this year.