| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] [v-ing] | 5703 |
|
| 2 | [prep] [v-ing] at | 2878 |
|
| 3 | [vb past] [v-ing] at | 551 |
|
| 4 | [vb past] [prep] at | 110 |
|
