| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [pers pn] [modal v] [vb infin] | 4910 |
|
| 2 | [adv] [pers pn] could [vb infin] | 3590 |
|
| 3 | [Wh adv] [pron] could [vb infin] | 763 |
|
| 4 | [Wh adv] [pers pn] could [verb] | 716 |
|
