| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [vb pp] that | 586 |
|
| 2 | it must [not/n't] be [vb pp] | 74 |
|
| 3 | must [not/n't] be [vb pp] that | 29 |
|
| 4 | it [not/n't] be [vb pp] that | 9 |
|
