| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at time of [verb] | 27 |
|
| 2 | at time [prep] [v-ing] | 27 |
|
| 3 | at time [prep] [verb] | 27 |
|
| 4 | at time of [verb] | 27 |
|
| 5 | at time [prep] going | 20 |
|
| 6 | at time [prep] go | 20 |
|
