| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | work have been [verb] at | 8 |
|
| 2 | work [verb] been [vb pp] at | 8 |
|
| 3 | work [vb -s] been [verb] at | 7 |
|
| 4 | work has been [verb] at | 7 |
|
