| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [verb] | 1448 |
|
| 2 | it must be [vb pp] | 1391 |
|
| 3 | it [modal v] be borne | 83 |
|
| 4 | it must be bear | 32 |
|
| 5 | [pron] must be borne | 32 |
|
| 6 | it must [be] borne | 31 |
|
