| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [noun prp] [prep] | 7277 |
|
| 2 | [noun prp] [prep] [v-ing] | 4404 |
|
| 3 | at [noun prp] [v-ing] | 193 |
|
| 4 | at [prep] [v-ing] | 44 |
|
