| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] [be] [adv] | 1594 |
|
| 2 | must be [vb pp] [prep] [adv] | 95 |
|
| 3 | must be [vb pp] [prep] [be] | 75 |
|
