| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [adv] [prep] a time when | 8 |
|
| 2 | [v-ing] [adv] at a time when | 6 |
|
| 3 | [v-ing] [adv prt] [prep] a time when | 6 |
|
