| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] [art] | 2134 |
|
| 2 | [modal v] be [v-ing] at | 519 |
|
| 3 | [modal v] be at [art] | 464 |
|
| 4 | be [v-ing] at [art] | 295 |
|
