| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [verb] [be] [v-ing] at | 242 |
|
| 2 | [Wh det] [verb] [be] [v-ing] [prep] | 199 |
|
| 3 | [Wh det] [verb] [be] [verb] at | 97 |
|
