| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was working at [noun] | 20 |
|
| 2 | [was/were] working at [noun prp] | 17 |
|
| 3 | were working at [noun] | 6 |
|
| 4 | [was/were] working at [noun sg] | 6 |
|
