| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] at a time | 48 |
|
| 2 | [was/were] [verb] at a time | 48 |
|
| 3 | [was/were] [vb pp] at a time | 42 |
|
| 4 | was [verb] at a time | 32 |
|
| 5 | were [verb] at a time | 16 |
|
| 6 | [was/were] [v-ing] at a time | 6 |
|
