| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] [prep] [adj] | 971 |
|
| 2 | be [vb pp] [prep] [be] [adj] | 537 |
|
| 3 | must be [vb pp] [prep] [be] | 75 |
|
| 4 | must be [vb pp] [be] [adj] | 8 |
|
