| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [modal v] have known | 22 |
|
| 2 | who [modal v] have known | 22 |
|
| 3 | who [modal v] [verb] known | 22 |
|
| 4 | who [vb mod] [verb] known | 22 |
|
| 5 | who [modal v] [vb infin] known | 22 |
|
| 6 | who should [verb] known | 16 |
|
| 7 | who should [verb] known | 16 |
|
