| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] to be [adv] | 9 |
|
| 2 | must be [vb pp] [prep] be [adv] | 9 |
|
| 3 | must be seen [prep] be [adv] | 5 |
|
| 4 | must be see [prep] be [adv] | 5 |
|
