| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] | 321580 |
|
| 2 | [prep] [v-ing] | 321556 |
|
| 3 | at [verb] | 4900 |
|
| 4 | at [v-ing] | 4674 |
|
