| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] at a | 830 |
|
| 2 | [was/were] [vb pp] at a | 613 |
|
| 3 | [was/were] done [prep] a | 78 |
|
| 4 | [be] done at a | 16 |
|
| 5 | [was/were] done at [art] | 14 |
|
| 6 | [was/were] do at a | 6 |
|
