| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [vb pp] at a time | 42 |
|
| 2 | [was/were] [vb pp] at a time | 42 |
|
| 3 | was [vb pp] at a time | 28 |
|
| 4 | were [vb pp] at a time | 14 |
|
