| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [modal v] [vb infin] | 586 |
|
| 2 | be [v-ing] [modal v] [verb] | 89 |
|
| 3 | [be] [v-ing] [modal v] [vb infin] | 87 |
|
