| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have | 5696 |
|
| 2 | who [modal v] have | 1308 |
|
| 3 | who could [verb] | 1259 |
|
| 4 | who could [vb infin] | 1251 |
|
| 5 | who could have | 125 |
|
