| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] be [adv] | 4427 |
|
| 2 | [pron] must be [adv] | 733 |
|
| 3 | [pers pn] must be [adv] | 604 |
|
| 4 | it must be [adv] | 279 |
|
| 5 | it must [be] [adv] | 267 |
|
| 6 | it must be [adv] | 267 |
|
