| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i could not [verb] [pron] | 1446 |
|
| 2 | i [modal v] not [verb] [indef pn] | 619 |
|
| 3 | [pron] could not [verb] [indef pn] | 357 |
|
| 4 | i could [adv] [verb] [indef pn] | 152 |
|
