| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [vb pp] at | 6660 |
|
| 2 | [vb pp] at a | 2778 |
|
| 3 | [was/were] [vb pp] a | 2666 |
|
| 4 | [was/were] at a | 386 |
|
