Make the active sentences passive. Use by where necessary. (In writing 1. William Shakespeare wrote Macbeth. 2. Macbeth was written by William Shakespeare. 3. They are performing a ballet at the concert hall this evening. 4. Does Lady Gaga design the costumes? 5. How many Hobbit films have they made? 6. The artist ought to sign the painting. 7. Thousands of people will visit the gallery this year.