| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] must be [vb pp] be [art] | 8 |
|
| 2 | which must be [vb pp] [be] [art] | 5 |
|
| 3 | [Wh det] must be [vb pp] [be] the | 5 |
|
