| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] to | 714 |
|
| 2 | must be [verb] [to-vb] | 629 |
|
| 3 | be [verb] [to-vb] to | 357 |
|
| 4 | must [verb] [to-vb] to | 14 |
|
