| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [adv] [adv] [vb infin] | 1617 |
|
| 2 | [Wh pn] [modal v] [adv] [adv] [vb infin] | 182 |
|
| 3 | [Wh pn] [vb mod] [adv] [adv] [vb infin] | 182 |
|
| 4 | [Wh pn] could [adv] [adv] [vb infin] | 44 |
|
| 5 | [Wh pn] could [adv] [adv] [verb] | 44 |
|
