| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pron] could | 2700 |
|
| 2 | [vb past] [pron] i | 1333 |
|
| 3 | [pron] i could | 631 |
|
| 4 | [vb past] i could | 535 |
|
