| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] [prep] [det] | 3559 |
|
| 2 | be [v-ing] at [det] | 392 |
|
| 3 | be [v-ing] [prep] at | 71 |
|
| 4 | [v-ing] [prep] at [det] | 12 |
|
| 5 | be [prep] at [det] | 9 |
|
