| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] time of [v-ing] | 292 |
|
| 2 | [art] time of [v-ing] [prep] | 86 |
|
| 3 | at time of [v-ing] [prep] | 20 |
|
| 4 | at [art] time [v-ing] [prep] | 9 |
|
