| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at the time [prep] | 491 |
|
| 2 | at the time [prep] [v-ing] | 279 |
|
| 3 | [verb] the time [prep] [v-ing] | 15 |
|
| 4 | [verb] at time [prep] [v-ing] | 7 |
|
