| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [noun prp] [modal v] [verb] | 306 |
|
| 2 | [adv] [noun prp] could [verb] | 196 |
|
| 3 | [Wh adv] [noun] could [verb] | 160 |
|
