| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] how [pron] could | 301 |
|
| 2 | [vb past] [adv] [pron] could | 206 |
|
| 3 | [vb past] how [pron] [modal v] | 136 |
|
| 4 | [vb past] [Wh adv] [pron] could | 85 |
|
| 5 | [vb past] how [pron] could | 54 |
|
