| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [be] [v-ing] [pers pn] | 324 |
|
| 2 | [prep] [be] [v-ing] at | 212 |
|
| 3 | [prep] [v-ing] [pers pn] at | 147 |
|
| 4 | [be] [v-ing] [pers pn] at | 130 |
|
