| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] [det] | 654 |
|
| 2 | [modal v] be [v-ing] at | 519 |
|
| 3 | be [v-ing] at [det] | 89 |
|
| 4 | [modal v] be at [det] | 48 |
|
