| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] they must be [vb pp] [prep] | 5 |
|
| 2 | [prep] they must [be] [vb pp] [prep] | 5 |
|
| 3 | [prep] they must be [vb pp] [prep] | 5 |
|
| 4 | [prep] them must [be] [vb pp] [prep] | 5 |
|
| 5 | [prep] they must [be] [vb pp] [prep] | 5 |
|
| 6 | [prep] they must [be] [vb pp] [prep] | 5 |
|
