| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [vb mod] [pron] | 176 |
|
| 2 | [vb past] [modal v] [pron] | 176 |
|
| 3 | [verb] could [pron] | 70 |
|
| 4 | [vb past] could [pron] | 27 |
|
