| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [verb] at the time | 20 |
|
| 2 | [prep] [verb] at the time | 19 |
|
| 3 | [prep] [v-ing] at the time | 19 |
|
| 4 | of [verb] at the time | 7 |
|
