| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they must be [vb pp] [prep] the | 24 |
|
| 2 | they must be [vb pp] [prep] the | 24 |
|
| 3 | they must be [vb pp] by the | 5 |
|
| 4 | they must be [vb pp] to the | 5 |
|
| 5 | they must be [vb pp] to the | 5 |
|
| 6 | they must be [vb pp] by the | 5 |
|
