| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [be] | 21175 |
|
| 2 | must [vb infin] [be] | 3545 |
|
| 3 | must [verb] [be] | 3545 |
|
| 4 | must have [be] | 3434 |
|
