| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] be | 3545 |
|
| 2 | [adv] [vb infin] be | 3145 |
|
| 3 | must [adv] [vb infin] | 2914 |
|
| 4 | must [adv] be | 1920 |
|
