| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [Wh pn] have [vb pp] back to | 7 |
|
| 2 | [Wh pn] have [vb pp] back to [noun] | 10 |
|
| 3 | [Wh pn] have [vb pp] back to [noun prp] | 9 |
|
