1. Sally was eating dinner last night when someone knocked on the door.
2. At 6:00 p.m., Bob sat down at the table and began to eat. At 6:05 Bob was eating dinner. While Bob was eating dinner, Ann came through the door. Bob went to bed at 10:30. At 11:00 Bob was sleeping. While Bob was sleeping, the phone rang.
3. My roommate's parents called him last night while we were watching TV. 4. I called Paul at 7:00 but it wasn't necessary because he already got up.
5. I began to study at seven last night. Fred came at seven-thirty. I was study when Fred came.
6. My mother called me around five. My husband came home a little after that. When he came home, I was talking to my mother on the phone.
7. While I was studying last night, Fred dropped by to visit me. 8. As I was crossing the road I stepped on a banana skin and fell heavily.
2. if i were you, ...little, ,harmless, to buy him, see, useful
вот так должно быть.