| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] been [v-ing] at | 14 |
|
| 2 | who have been [v-ing] at | 14 |
|
| 3 | who [vb past] been [v-ing] at | 9 |
|
| 4 | who had been [v-ing] at | 6 |
|
| 5 | who [verb] been looking at | 5 |
|
