| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] they must be [vb pp] | 22 |
|
| 2 | [adv] they must be [vb pp] | 22 |
|
| 3 | [adv] they must be [vb pp] | 22 |
|
| 4 | [adv] they must be [vb pp] | 19 |
|
| 5 | then they must be [vb pp] | 8 |
|
| 6 | then they must be [vb pp] | 8 |
|
