| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] a | 9915 |
|
| 2 | [was/were] [verb] at | 9488 |
|
| 3 | [verb] at a | 8330 |
|
| 4 | [was/were] at a | 474 |
|
