| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [vb infin] [adv] | 2108 |
|
| 2 | [Wh det] [modal v] [vb infin] [adv] | 726 |
|
| 3 | [Wh det] could [vb infin] [adv] | 110 |
|
| 4 | [Wh det] could [verb] [adv] | 64 |
|
