| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [pron] could [verb] | 6827 |
|
| 2 | [vb past] [subord] [pron] [verb] | 5328 |
|
| 3 | [vb past] [pron] could [verb] | 1462 |
|
| 4 | [vb past] [subord] [pron] could | 402 |
|
