| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [not/n't] be [vb pp] | 544 |
|
| 2 | this must be [vb pp] | 200 |
|
| 3 | this must [not/n't] be | 16 |
|
| 4 | this [not/n't] be [vb pp] | 6 |
|
