| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] [vb pp] [prep] [noun] | 970 |
|
| 2 | [verb] [vb pp] back [prep] [noun] | 215 |
|
| 3 | who [verb] [vb pp] back [prep] | 31 |
|
| 4 | who [verb] back [prep] [noun] | 18 |
|
