| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] must be [vb pp] at [art] | 9 |
|
| 2 | which must be [vb pp] at [art] | 8 |
|
| 3 | [Wh det] must be [vb pp] at the | 8 |
|
