| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [pron] [vb past] at a time | 6 |
|
| 2 | [pron] [vb past] at a time when | 12 |
|
| 3 | [pron] [vb past] at a time [adv] | 12 |
|
| 4 | [pron] [vb past] at a time [Wh adv] | 12 |
|
| 5 | [pron] [vb past] at a time when | 12 |
|
