| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have [vb pp] back [prep] | 31 |
|
| 2 | [Wh pn] had [vb pp] back [prep] | 18 |
|
| 3 | [Wh pn] have [vb pp] back to | 15 |
|
| 4 | [Wh pn] have come back [prep] | 13 |
|
| 5 | [Wh pn] have [vb pp] back from | 11 |
|
| 6 | [Wh pn] has [vb pp] back [prep] | 5 |
|
