| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [verb] of | 27 |
|
| 2 | must [verb] [vb pp] of | 24 |
|
| 3 | must have [verb] of | 19 |
|
| 4 | must have [verb] of | 19 |
|
