| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [be] [vb pp] [prep] | 21481 |
|
| 2 | must [be] [vb pp] [prep] | 4921 |
|
| 3 | must [adv] [be] [vb pp] | 996 |
|
| 4 | must [adv] [be] [prep] | 100 |
|
