| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pron] [pron] could | 351 |
|
| 2 | [vb past] [pron] [pers pn] could | 332 |
|
| 3 | [vb past] [pron] i [modal v] | 299 |
|
| 4 | [verb] [pron] i could | 175 |
|
| 5 | [vb past] [pron] i could | 90 |
|
