| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] see [pron] | 401 |
|
| 2 | could [not/n't] [verb] i | 147 |
|
| 3 | [modal v] [not/n't] see i | 53 |
|
| 4 | could [adv] see i | 18 |
|
