| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] [prep] | 4039 |
|
| 2 | to be [v-ing] [prep] | 1893 |
|
| 3 | [modal v] to be [prep] | 336 |
|
| 4 | [modal v] to be [v-ing] | 252 |
|
| 5 | [modal v] to [v-ing] [prep] | 6 |
|
