| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [to-vb] been [verb] at | 9 |
|
| 2 | [vb past] [to-vb] be [vb pp] at | 9 |
|
| 3 | [vb past] to have be [verb] at | 9 |
|
