| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] [prep] [det] | 63 |
|
| 2 | be [verb] [prep] at [det] | 52 |
|
| 3 | be [v-ing] [prep] at [adj] | 14 |
|
| 4 | [be] [v-ing] [prep] at [det] | 11 |
|
