| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i could [vb infin] | 8145 |
|
| 2 | [vb past] i [vb infin] | 1162 |
|
| 3 | [vb past] i could | 535 |
|
| 4 | [vb past] could [vb infin] | 53 |
|
