| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | if [pers pn] could [vb infin] | 2533 |
|
| 2 | [vb past] [pers pn] could [vb infin] | 1430 |
|
| 3 | [vb past] if [pers pn] could | 253 |
|
