| A | B |
| I was driving along the road | when I realised my boot was open. |
| He was painting the windows | when he fell off the ladder. |
| At 8 o'clock yesterday evening | I was watching television. |
| While I was cooking | the chip pan caught fire. |
| A policeman called | while I was having a bath. |
| I was cleaning my car | when a lorry reversed into it. |
| What were you doing | at 4 o'clock last Saturday afternoon? |
| While she was sewing | she cut her finger. |