| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] a | 28724 |
|
| 2 | [vb past] back [prep] | 8025 |
|
| 3 | back [prep] a | 1574 |
|
| 4 | [vb past] back a | 171 |
|
