| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] time of | 3085 |
|
| 2 | [art] time of [v-ing] | 339 |
|
| 3 | at [art] time [v-ing] | 30 |
|
| 4 | at time of [v-ing] | 27 |
|
