| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [verb] [pron] | 55080 |
|
| 2 | [verb] [pron] could | 6733 |
|
| 3 | [vb past] [pron] could | 2700 |
|
| 4 | [vb past] [verb] could | 28 |
|
