| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [conj] at a time [Wh adv] | 7 |
|
| 2 | [verb] [conj] at a time [adv] | 7 |
|
| 3 | [verb] [conj] at a time when | 7 |
|
| 4 | [verb] [conj] at a time when | 7 |
|
