| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] could [pron] [adv] have [verb] | 24 |
|
| 2 | [Wh adv] could [pron] [adv] have [vb pp] | 24 |
|
| 3 | [Wh adv] could [pron] [adv] [vb infin] known | 5 |
|
| 4 | [Wh adv] could [pron] [adv] have known | 5 |
|
| 5 | [Wh adv] could [pron] [adv] have know | 5 |
|
| 6 | [Wh adv] could [pron] [adv] have known | 5 |
|
| 7 | [Wh adv] [vb mod] [pron] [adv] have known | 5 |
|
| 8 | [Wh adv] [modal v] [pron] [adv] have known | 5 |
|
| 9 | [adv] could [pron] [adv] have known | 5 |
|
| 10 | [Wh adv] could [pron] [adv] [verb] known | 5 |
|
