| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at a time when | 49 |
|
| 2 | [pers pn] at a time when | 16 |
|
| 3 | [pers pn] [vb past] at a time | 14 |
|
| 4 | [pers pn] [vb past] a time when | 5 |
|
