| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have [verb] back | 37 |
|
| 2 | who have [vb pp] back | 37 |
|
| 3 | who had [verb] back | 22 |
|
| 4 | who have come back | 15 |
|
| 5 | who have come back | 15 |
|
| 6 | who has [verb] back | 5 |
|
