| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] working at the time | 9 |
|
| 2 | be working at the time | 9 |
|
| 3 | [was/were] working at the time | 8 |
|
| 4 | was working at the time | 6 |
|
| 5 | working at the time [prep] | 5 |
|
| 6 | working at the time [prep] | 5 |
|
