| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adv] [v-ing] [prep] | 751 |
|
| 2 | at [adv] [verb] [prep] | 404 |
|
| 3 | at [adv] [v-ing] [prep] | 54 |
|
| 4 | at [adv] [v-ing] [prep] | 50 |
|
