| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] at the time | 208 |
|
| 2 | [was/were] [v-ing] at the time | 65 |
|
| 3 | [was/were] working at the [noun] | 26 |
|
| 4 | [was/were] working at the [noun sg] | 21 |
|
| 5 | [was/were] working [prep] the time | 9 |
|
| 6 | [be] working at the time | 9 |
|
| 7 | [was/were] working at the time | 8 |
|
| 8 | [was/were] work at the time | 8 |
|
| 9 | [was/were] working at [art] time | 8 |
|
