| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] | 21338 |
|
| 2 | [adv] could [not/n't] | 1227 |
|
| 3 | [adv] [not/n't] [vb infin] | 864 |
|
| 4 | [adv] could [vb infin] | 630 |
|
