| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] been [verb] on | 57 |
|
| 2 | who had been [verb] on | 52 |
|
| 3 | who [vb past] been [vb pp] on | 34 |
|
| 4 | who [vb past] been [v-ing] on | 23 |
|
| 5 | who [vb past] been work on | 5 |
|
| 6 | who 'd been [verb] on | 5 |
|
| 7 | who [vb past] been working on | 5 |
|
