| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] | 79530 |
|
| 2 | [be] [v-ing] [prep] | 71147 |
|
| 3 | [be] [verb] at | 27063 |
|
| 4 | [be] [v-ing] at | 6347 |
|
