9. (?) Were the students listening to audio materials when the headmaster knocked on the door? (Apakah para siswa sedang mendengarkan materi audio ketika kepala sekolah mengetuk pintu?)
10. (+) My sister was sleeping when my grandparents went home. (Adikku sedang tidur ketika kakek nenekku pulang)
11. (-) My sister wasn’t sleeping when my grandparents went home. (Adikku tidak sedang tidur ketika kakek nenekku pulang)
12. (?) Was your sister sleeping when your grandparents went home? (Apakah adikmu sedang tidur ketika kakek nenekmu pulang?)
13. (+) The barista was brewing coffee when the manager called him. (Barista itu sedang menyeduh kopi ketika manajer memanggilnya)