| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [vb pp] at | 4126 |
|
| 2 | [verb] back at | 1630 |
|
| 3 | [verb] [vb pp] back | 1338 |
|
| 4 | [vb pp] back at | 105 |
|
