| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [Wh det] [pron] could | 352 |
|
| 2 | [vb past] [pron] [pron] could | 351 |
|
| 3 | [vb past] [Wh det] [pron] [modal v] | 258 |
|
