| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [verb] at an | 18 |
|
| 2 | [be] [verb] [to-vb] at an | 14 |
|
| 3 | [be] [vb pp] [verb] at an | 14 |
|
| 4 | [was/were] [verb] [verb] at an | 6 |
|
| 5 | [is] [verb] [verb] at an | 5 |
|
