| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [pron] could [vb infin] | 763 |
|
| 2 | [Wh adv] [indef pn] [modal v] [vb infin] | 226 |
|
| 3 | [adv] [indef pn] could [vb infin] | 147 |
|
| 4 | [Wh adv] [indef pn] could [verb] | 46 |
|
