| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [vb infin] [vb pp] a | 642 |
|
| 2 | must [vb infin] [vb pp] a | 398 |
|
| 3 | must [adv] [vb infin] a | 256 |
|
| 4 | must [adv] [vb infin] [vb pp] | 194 |
|
