6 Find mistakes and correct them. 1) They had arrived at the airport on time yesterday. 2) Colin was finishing his work before he went to bed. 3) Jessica had cut her finger when she was slicing bread. 4) Sally was taking a bath for ten minutes before the water was cut off. 5) The secretary had been making copies when the photocopier broke down. 6) She washed the dishes and had poured herself a cup of tea. 7) Nick went to the swimming pool after he was watching the news. 8) While we were gathering vegetables in the garden our mother had made an apple pie for dessert. 9) Gordon felt sleepy because he worked all night. 10) Wendy was studying management for three years before she got her diploma.