| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [adv] [vb infin] [vb pp] a | 12 |
|
| 2 | must [adv] have [vb pp] a | 12 |
|
| 3 | must [adv] [vb infin] [vb pp] a | 10 |
|
| 4 | must [adv] [vb infin] [vb pp] a | 10 |
|
