| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who had been | 3019 |
|
| 2 | who have been | 1049 |
|
| 3 | who has been | 940 |
|
| 4 | who 's been | 225 |
|
| 5 | who 'd been | 216 |
|
| 6 | who 've been | 190 |
|
