| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] at a | 711 |
|
| 2 | [verb] at a time | 345 |
|
| 3 | [was/were] at a time | 21 |
|
| 4 | [was/were] [verb] a time | 5 |
|
