| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] it could [vb infin] | 49 |
|
| 2 | how it could [vb infin] | 38 |
|
| 3 | [Wh adv] it could have | 20 |
|
| 4 | where it could [vb infin] | 7 |
|
