| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] at [art] | 1028 |
|
| 2 | [prep] [be] [v-ing] [art] | 1012 |
|
| 3 | [prep] [be] at [art] | 305 |
|
| 4 | [be] [v-ing] at [art] | 295 |
|
| 5 | [prep] [be] [v-ing] at | 219 |
|
