| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [vb past] [pron] [pron] could | 24 |
|
| 2 | [adv] [vb past] [Wh det] [pron] [vb mod] | 24 |
|
| 3 | [adv] [vb past] [Wh det] [pron] [modal v] | 24 |
|
| 4 | [adv] [verb] [Wh det] [pron] could | 21 |
|
| 5 | [adv] [vb past] [Wh det] [pron] could | 6 |
|
| 6 | [adv] [vb past] [Wh det] [pron] could | 6 |
|
