| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] [adv] as [verb] | 7 |
|
| 2 | must be [vb pp] [adv] [subord] [verb] | 7 |
|
| 3 | must be [vb pp] [adv] [subord] [to-vb] | 6 |
|
| 4 | must be [vb pp] so [subord] [verb] | 6 |
|
