ex3:change the following sentences into passive voice: 1.someone saw him pick up the gun. 2.we believe that he has special knowledge which may be useful to the police. 3.you needn't have done it. 4.he likes people call him "sir". 5.don't touch this switch . 6.he doesn't like people laughing at him. 7.you don't need to wind this watch. 8.they decided to divide the money between the windows of the lifeboat men. 9. people believe that he was killed by terrorists. 10.they are to send letters to the leaders of charitable organization. 11.we consider that she was the best singer that Australia has ever produced. 12.they urged the government to create more jobs . 13.they suggested banning the sale of alcohol at football chess. Giải thik cho mik ạ