| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been [verb] at | 747 |
|
| 2 | [vb past] been [verb] an | 92 |
|
| 3 | [vb past] [verb] at an | 34 |
|
| 4 | been [verb] at an | 25 |
|
