| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | were [verb] at a time when | 10 |
|
| 2 | were [verb] at a time when | 10 |
|
| 3 | were [verb] at a time [Wh adv] | 10 |
|
| 4 | were [verb] at a time [adv] | 10 |
|
| 5 | [noun] were [verb] at a time | 13 |
|
| 6 | [noun pl] were [verb] at a time | 11 |
|
