| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i could [vb infin] [adv] | 809 |
|
| 2 | i [modal v] [vb infin] [Wh adv] | 418 |
|
| 3 | [pron] could [vb infin] [Wh adv] | 216 |
|
| 4 | i could [verb] [Wh adv] | 50 |
|
