| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [modal v] [vb infin] | 9111 |
|
| 2 | [prep] [Wh pn] [modal v] | 466 |
|
| 3 | [prep] [modal v] [vb infin] | 252 |
|
