| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] back [conj] [verb] at | 60 |
|
| 2 | [vb pp] [adv] [conj] [verb] at | 53 |
|
| 3 | [vb pp] back [conj] [verb] [prep] | 28 |
|
| 4 | [vb pp] back [conj] [verb] [prep] | 28 |
|
| 5 | [vb pp] back [conj] [verb] at | 6 |
|
