4. (+) I was waiting for the package when she came. (Aku sedang menunggu paket saat dia datang)
5. (-) I wasn’t waiting for the package when she came. (Aku tidak sedang menunggu paket saat dia datang)
6. (?) Were you waiting for the package when your brother came? (Apakah kamu sedang menunggu paket saat dia datang?)
7. (+) The students were listening to audio materials when the headmaster knocked on the door. (Para siswa sedang mendengarkan materi audio ketika kepala sekolah mengetuk pintu)
8. (-) The students were not listening to audio materials when the headmaster knocked on the door. (Para siswa tidak sedang mendengarkan materi audio ketika kepala sekolah mengetuk pintu)