| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it must be [vb pp] | 148 |
|
| 2 | it must [not/n't] be [vb pp] | 74 |
|
| 3 | [coord] must [not/n't] be [vb pp] | 35 |
|
| 4 | [coord] it must [not/n't] be | 19 |
|
