| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] they be [vb pp] | 670 |
|
| 2 | they must be [vb pp] | 304 |
|
| 3 | [prep] they must be | 26 |
|
| 4 | [prep] must be [vb pp] | 7 |
|
