| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] [Wh adv] [pron] | 182 |
|
| 2 | [prep] [Wh adv] [pron] could | 117 |
|
| 3 | [vb past] [Wh adv] [pron] could | 85 |
|
| 4 | [vb past] [prep] [pron] could | 39 |
|
