| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [vb pp] [prep] | 74295 |
|
| 2 | must be [verb] [prep] | 5095 |
|
| 3 | must [be] [vb pp] [prep] | 4921 |
|
| 4 | must be [vb pp] [prep] | 4921 |
|
| 5 | must [be] [vb pp] [prep] | 4919 |
|
| 6 | must be [vb pp] [prep] | 4919 |
|
