| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [adv] be [vb pp] to be | 9 |
|
| 2 | must [adv] be seen to be | 6 |
|
| 3 | must not be [vb pp] to be | 5 |
|
| 4 | must [not/n't] be [vb pp] to be | 5 |
|
