| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [art] | 2268 |
|
| 2 | [Wh det] must be | 702 |
|
| 3 | [Wh det] must [art] | 9 |
|
| 4 | [Wh det] be [art] | 5 |
|
