| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] at the time of [v-ing] | 9 |
|
| 2 | [pron] at the time of [v-ing] | 9 |
|
| 3 | [pron] at the time [prep] [v-ing] | 9 |
|
| 4 | [pers pn] at the time [prep] [v-ing] | 5 |
|
