| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [pron] could [not/n't] [vb infin] | 1285 |
|
| 2 | [conj] i could [not/n't] [vb infin] | 1138 |
|
| 3 | [subord] i [modal v] [not/n't] [vb infin] | 984 |
|
| 4 | [subord] i could [adv] [vb infin] | 471 |
|
| 5 | [subord] i could [not/n't] [verb] | 306 |
|
