| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [verb] [vb pp] [prep] | 3272 |
|
| 2 | [verb] [vb pp] back [prep] | 742 |
|
| 3 | [Wh pn] [verb] back [prep] | 56 |
|
| 4 | [Wh pn] [verb] [vb pp] back | 37 |
|
