| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have been [vb pp] at | 35 |
|
| 2 | who had been [verb] at | 28 |
|
| 3 | who have been [v-ing] at | 14 |
|
| 4 | who 'd been [verb] at | 6 |
|
| 5 | who has been [verb] at | 6 |
|
| 6 | who have been [verb] at | 6 |
|
| 7 | who have been look at | 5 |
|
| 8 | who have been looking at | 5 |
|
| 9 | who have been educated at | 5 |
|
| 10 | who have been educate at | 5 |
|
