| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [adv] [prep] | 670 |
|
| 2 | [vb infin] [adv] [prep] be | 584 |
|
| 3 | must [vb infin] [prep] be | 88 |
|
| 4 | must [vb infin] [adv] be | 37 |
|
