| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [be] [verb] | 783 |
|
| 2 | must have [be] [prep] | 289 |
|
| 3 | must [be] [prep] [verb] | 39 |
|
| 4 | have [be] [prep] [verb] | 36 |
|
