| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [prep] | 4043 |
|
| 2 | must [vb infin] be | 3545 |
|
| 3 | [vb infin] be [prep] | 1772 |
|
| 4 | must be [prep] | 1101 |
|
