| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] be [adj] | 156 |
|
| 2 | it [modal v] [verb] be [det] | 90 |
|
| 3 | [pron] must [verb] be [det] | 85 |
|
| 4 | it must [verb] [be] [det] | 26 |
|
