| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb past] [vb pp] at | 109 |
|
| 2 | they [vb past] [vb pp] back | 31 |
|
| 3 | they [vb past] back at | 18 |
|
| 4 | [vb past] [vb pp] back at | 17 |
|
