| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [Wh adv] [vb mod] | 686 |
|
| 2 | [adv] [Wh adv] [modal v] | 686 |
|
| 3 | [adv] [adv] could | 377 |
|
| 4 | [adv] [Wh adv] could | 88 |
|
