| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [pron] could | 1347 |
|
| 2 | [Wh adv] [ex0] [modal v] | 138 |
|
| 3 | [Wh adv] [ex0] [vb mod] | 138 |
|
| 4 | [adv] [ex0] could | 76 |
|
| 5 | [Wh adv] [ex0] could | 9 |
|
